Critical Reasoning

Reducing speed limits neither saves lives nor protects the environment. This is
because the more slowly a car is driven, the more time it spends on the road spewing exhaust into the air and running the risk of colliding with other vehicles.
The argument's reasoning is flawed because the argument
(A) neglects the fact that some motorists completely ignore speed limits.
(B) Ignore the possibility of benefits from lowering speed limits other than environmental and safety benefits.
(C) Fails to consider that if speed limits are reduced, increased driving times will increase the number of cars on the road at any given time.
(D) Presumes, without providing justification, that total emissions for a given automobile trip are determined primarily by the amount of time the trip takes
(E) Presumes, without providing justification, that drivers run a significant risk of collision only if they spend a lot of time on the road.

IMO E

garima99 wrote:Reducing speed limits neither saves lives nor protects the environment. This is
because the more slowly a car is driven, the more time it spends on the road spewing exhaust into the air and running the risk of colliding with other vehicles.
The argument's reasoning is flawed because the argument
(A) neglects the fact that some motorists completely ignore speed limits.
(B) Ignore the possibility of benefits from lowering speed limits other than environmental and safety benefits.
(C) Fails to consider that if speed limits are reduced, increased driving times will increase the number of cars on the road at any given time.
(D) Presumes, without providing justification, that total emissions for a given automobile trip are determined primarily by the amount of time the trip takes
(E) Presumes, without providing justification, that drivers run a significant risk of collision only if they spend a lot of time on the road.

B

IMO D

garima99 wrote:Reducing speed limits neither saves lives nor protects the environment. This is
because the more slowly a car is driven, the more time it spends on the road spewing exhaust into the air and running the risk of colliding with other vehicles.
The argument's reasoning is flawed because the argument
(A) neglects the fact that some motorists completely ignore speed limits.
(B) Ignore the possibility of benefits from lowering speed limits other than environmental and safety benefits.
(C) Fails to consider that if speed limits are reduced, increased driving times will increase the number of cars on the road at any given time.
(D) Presumes, without providing justification, that total emissions for a given automobile trip are determined primarily by the amount of time the trip takes
(E) Presumes, without providing justification, that drivers run a significant risk of collision only if they spend a lot of time on the road.

garima99 wrote:Reducing speed limits neither saves lives nor protects the environment. This is
because the more slowly a car is driven, the more time it spends on the road spewing exhaust into the air and running the risk of colliding with other vehicles.
The argument's reasoning is flawed because the argument
(A) neglects the fact that some motorists completely ignore speed limits.
(B) Ignore the possibility of benefits from lowering speed limits other than environmental and safety benefits.
(C) Fails to consider that if speed limits are reduced, increased driving times will increase the number of cars on the road at any given time.
(D) Presumes, without providing justification, that total emissions for a given automobile trip are determined primarily by the amount of time the trip takes
(E) Presumes, without providing justification, that drivers run a significant risk of collision only if they spend a lot of time on the road.

E seems to be attractive but the author nowhere suggest that "only if they spend a lot of time on the road", so Eliminate E.D considers the issue properly,so IMO "D".

Should be D, can an expert comment on this CR!