Bunuel
For most consumers,
choosing a new car over a second-hand one mostly depends on if they have enough money.
A. choosing a new car over a second-hand one mostly depends on if they have enough money
B. whether they choose a new car over a second-hand one mostly depends on if they have enough money
C. choosing a new car over a second-hand one mostly depends on whether they have enough money or not
D. choosing a new car over a second-hand one depends on whether they have enough money
E. choosing a new car over a second-hand one mostly depends on whether they have enough money
OFFICIAL EXPLANATION
For most consumers, choosing a new car over a second-hand one mostly depends on if they have enough money.A. choosing a new car over a second-hand one mostly depends on if they have enough money
If is used in the GMAT in Conditionals only. Since in this question there is no condition, if should be replaced by whether.B. whether they choose a new car over a second-hand one mostly depends on if they have enough money
This answer choice repeats the original mistake. If is used in the GMAT in Conditionals only. Since in this question there is no condition, if should be replaced by whether (that is, if they have money should be replaced with whether they have enough money.)
While this answer choice uses the word whether, it doesn't replace if.
Also, replacing the single word choosing with the three-word phrase whether they choose creates redundancy.C. choosing a new car over a second-hand one mostly depends on whether they have enough money or not
While this answer choice corrects the original mistake and is grammatically correct, it is stylistically flawed. Using or not after whether is redundant.
It is true that stylistic mistakes are not always corrected. However, since there is another grammatically correct answer choice that is also more concise than this one, it is preferable. Look for it!D. choosing a new car over a second-hand one depends on whether they have enough money
While this answer choice corrects the original mistake and is grammatically correct, it changes the meaning of the original sentence by omitting the word mostly.E. choosing a new car over a second-hand one mostly depends on whether they have enough money
If is used in the GMAT in Conditionals only. Since in this question there is no condition, if should be replaced by whether, as this answer choice indeed does.