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.
Answer:
B) text explaining the history of the Civil Rights Movement
D) a book about the life of President John F. Kennedy
Explanation:
Nonfiction sources are real and contain facts rather than creating stories that do not necessarily have to be true rather than imagined. The above are nonfiction examples since they are factual.
Your tree house is amazing!
and
I will let you know if I need help.