Which answer is the sentence fragment?
a. a few people were whistling or humming the most popular songs.
b. we waited for the third train before we were able to leave the station.
c. the man who is wearing a baseball cap backwards.
d. was the subway station packed with people leaving the concert?

C is the correct answer, because it is the only example which sounds unfinished, it is not completed, therefore it is the sentence fragment. 

There is nothing inherently wrong with being gay. speaking generally, opposition to gays are usually judged on people's moral basis whether it be religion, experience or other factors. to conclude, there is no objective answer to this question only subjective ones that rely on people's idea of what is right and wrong.