agautamdai wrote:
But the answer to the question is A. My answer to the question was also D but the second statement gives the explaination for some thing which the author is saying might be possible and hence it can not be taken as a conclusion.
Sorry, but A is just flat out wrong. The second part of A states that the second boldface is evidence; here is the second boldface:
They might well be overoptimistic;This is not evidence. Evidence is something factual, such as research or an actual event. This boldface is clearly an opinion, which cannot be characterized as evidence.
Sorry, but as Stacey pointed out, this is a poor question and should not be used as preparation for the GMAT.