As you can see, in the literal "middle" of the words "March" and "April", there's the letter "r": March and April.
However, the letter "r" doesn't appear at the start or end of each word, and obviously, you don't see the letter "r" at the beginning and end of a physical month.
I would say the theme is literary. The kid who doesn't study gets a bad grade while the one who did is the first one finished. But it isn't stated explicitly (as a direct or stated theme would be). I hope this helps.
I think the answer is B because their word choice made me feel sympathy for Mundra and what she went through for her to ache all over and even her heart.
