I would say the answer is D.
I think the answer is A because when you have a mix of interests then you can go far
Answer: what he means is that the way society has changed it seems as if no one uses common sense anymore .
Explanation: When the term mentally dead it is the response of not using your brain as in common sense.
I think the theme would be "exploration". Throughout the story, Rahul had learned so many things that he never thought that he would be learning in school. There were so many first times and learnings that he had learned from Ashkok's fish shop. He was able to breed fishes and learned the feeling of accomplishing something on your own.