I think the answer is B. As long as the clause after the colon is independent, you can capitalize it.
I would say the first one
Answer:
which sentences? can you please add the sentences in order for us to solve
Answer:
Nature Takes Center Stage
Explanation:
In The Adventures of Huckleberry Finn by Mark Twain, the beauty and simplicity, the unpredictability and power of nature play a prominent role in the story. We see from the beginning that the river is where Huck feels calm and at peace.
