vsatish_chandra wrote:
However, the explanation given for answer choice A says that there is no subject in the second part of the sentence - this is what I am having trouble with.
I think this is more an interpretation of what they are saying. They are saying that you don't have a "subject AND verb"; in other words, they are saying that you don't have the complete construction that you need. I don't think they are really commenting on whether you have one or the other. Tricky stuff! :-)