Since I don’t know what the story is about, I can only infer that this is from Witcher 3 where you hunt for the ghost of the well. Children and the man were consumed by the ghost.
C. concerned.
I think Benvolio is concerned because when hes speaking to Montague he says he had seen how depressed Romeo was but he didn't want to go after him because he wanted to be alone but he reassured Montague that he would go and check on romeo if he was OK....<span />
I believe that the answer is D, I hope it helps!