Engineers are attempting to make PX-1000 series cars more environmentally friendly by increasing their use of natural gases. One plan to accomplish this is to use organic waste to power cars. When organic waste decomposes, it releases fuel that is much more powerful than crude oil.

Which of the following, if true, would indicate the most serious weakness in the plan above?
(A) Some parts of the world do not generate enough organic waste to power a significant number of automobiles.
(B) All existing mechanisms to operate engines with fuel drawn from decomposed organic waste are too large to fit in automobiles.
(C) Even if organic waste proves to be an effective alternative to crude oil, some car owners will be reluctant to buy cars that run on this new fuel.
(D) Each year several million tons of organic waste decomposes but is not used to the full extent of its energy potential.
(E) Organic waste is more valuable as fuel to companies required to cut carbon emissions than to automobile drivers.

Issue: to make environmentally friendly car using organic waste
[spoiler]A - non availability of waste...out of scope...no impact on issue above
B - mechanism to operate engine with waste available but not practiacble to use....means they can't make envi friendly car (correct)
C, D, E - no impact on issue[/spoiler]

[spoiler]IMO: B[/spoiler]

IMO B

Premise 1 : Engineers are attempting to make PX-1000 series cars more environmentally friendly by increasing their use of natural gases. One plan to accomplish this is to use organic waste to power cars.

Premise 2 : When organic waste decomposes, it releases fuel that is much more powerful than crude oil.

Note : The stimulus dose not contain a conclusion but only set of facts .

The question asks to weaken the plan that is premise 1 . Any answer option that attack premise 2 can be directly eliminated.

(A) Some parts of the world do not generate enough organic waste to power a significant number of automobiles.
[Trap answer , SOME dose not mean ALL and we are not discussing how much waste is needed to power the automobile , eliminate.]
(B) All existing mechanisms to operate engines with fuel drawn from decomposed organic waste are too large to fit in automobiles.
[The plan is to run cars on fule generated from organic waste . Now mechanism that can not be fitted in the cars poses a major threat to the success of the plan, definitely a contender , lets look at other options.]
(C) Even if organic waste proves to be an effective alternative to crude oil, some car owners will be reluctant to buy cars that run on this new fuel.
[How dose people choosing to buy or not buy the car effect the plan?Eliminate.]
(D) Each year several million tons of organic waste decomposes but is not used to the full extent of its energy potential.
[Attacks premise 2 , eliminate.]
(E) Organic waste is more valuable as fuel to companies required to cut carbon emissions than to automobile drivers.
[We are not comparing companies with automobiles , eliminate.]

B wins .

OA-B
Thanks Guys

OA must be B....but I am not convinced with the same. However, I reached the same by POE.

sanyalpritish wrote:Engineers are attempting to make PX-1000 series cars more environmentally friendly by increasing their use of natural gases. One plan to accomplish this is to use organic waste to power cars. When organic waste decomposes, it releases fuel that is much more powerful than crude oil.

Which of the following, if true, would indicate the most serious weakness in the plan above?
(A) Some parts of the world do not generate enough organic waste to power a significant number of automobiles. - Incorrect - What if PX-1000 is for US, since US generates more organic waste, in that case why should I consider whether India generates more organic waste?
(B) All existing mechanisms to operate engines with fuel drawn from decomposed organic waste are too large to fit in automobiles. - Correct - I have a question here. Engineers are attempting to make the car. Means they are developing something or doing some research. In that case why don't they create some mechanism, which will fit in the car? I am not throughly agree with this answer, but this is best among all other worst
(C) Even if organic waste proves to be an effective alternative to crude oil, some car owners will be reluctant to buy cars that run on this new fuel. - Incorrect - Here the scope is Some car owners. Let's say out of 100 only 10 will be reluctant, what about rest 90?
(D) Each year several million tons of organic waste decomposes but is not used to the full extent of its energy potential. - Incorrect - This is out of scope
(E) Organic waste is more valuable as fuel to companies required to cut carbon emissions than to automobile drivers. - Incorrect - Which companies. irrelevent.