biswarup1234
Can someone pls let me know -
tomato is not a vegetable but a fruit ….OR….A tomato is not a vegetable but is a fruit - which one is correct?
In the above question why C is wrong??
Wow, that's pretty tough.
You are correct to say, "a tomato is not a vegetable, but a fruit."
In your tomato sentence, since there is only one verb, "is," there is no need to repeat it a second time -- the meaning is clear.
In this GMAT question, however, there are multiple verbs competing for attention, specifically, "are," "favored," and "enhance."
Since there are so many verbs, leaving out the verb after "but" creates some confusion and makes the sentence harder to read. Theoretically without the second "are," the sentence could appear to mean "..., but enhance simply random..." or "..., but favored simply random...", rather than the intended meaning, "..., but are simply random..."
Because of this potential confusion between verbs, and the fact that the inclusion of "are" makes the sentence easier to understand, D is a better answer than C.
Hope that helps