I believe it is c.
I know that d is wrong for sure so my answer would be c
I think the best answer will be c because everyone knows how he spends time
I think the answer would be C, because an implicit theme is one that's hidden in the story and you kind of have to dig into the piece and look for it.
Its A, for example when the author mentions a phenix in the book Fahrenheit 451, it is a symbol of the rebirth of ideas that will soon come, not a literal phoenix.