what is the right answer and why

[sameer_kalra]

Many consider two-wheeled vehicles to be most practical of the personal transport solutions for mobility within a bustling metropolitan center.


a) to be most practical

b) most practical

c) to be the most practical

d) the most practical

e) as the most practical

[AnjaliOberoi]

a) to be most practical

b) most practical

c) to be the most practical

d) the most practical

e) as the most practical

Consider to be, consider as -> both are unidiomatic
Among (b) and (d)- i think b is the correct answer...

Experts can put some light

[theCodeToGMAT]

Correct idiom is "considered"; ignore A,C,E

we need noun form.. "the most practical" is best form; ignore B

must be [spoiler]{D}[/spoiler]

[aditya8062]

OK all are able to eliminate rest except B and D .out of these two D is answer !!
we need "the most ..."
the reason is we are pointing this particular solution from rest of the personal transport solutions.hence we need "the"
similar construction : he is one of the best teachers --->he is one out of the rest

rahul wrote :we need noun form..

i am not sure as why u have written this .well this sentence would have been good :Many consider two-wheeled vehicles practical
the reason is now that "of" construction is missing so we dont have to pinpoint using "the"

[sameer_kalra]

Thanks guys ! Now I find it easy (after knowing the answer )

A,C,E are unidiomatic
and with superlative (most) we should prefix "the" - of course another explanation for you using "the" could be that the "best" or "most" needs to be specifically pointed out.

That's it, D is the answer.

Thanks again

[ceilidh.erickson]

Idioms are often tested on Sentence Correction (to the consternation of many non-native English speakers), but they are never the ONLY thing tested in a given sentence. Almost every SC question tests at least 2 issues of grammar and/or meaning, and most test 3 or 4. You will never see a real GMAT question like this.