Answer:
C. It ends with a marriage, but also with Prospero giving up his powers.
Explanation:
The tempest is a play written by William Shakespeare between 1610-1611, it narrates the story of Prospero a magician that sets a storm to wreck a ship, this sets the story to kill the King of Naples. While it is a romantic style play, it isn´t traditional because of the ending, it end with the marriage and the magician giving up his powers.
The main idea doesn't explain in detail why it is the main idea. It doesn't prove that it is the main idea, it only states so.
I think it’s put on or thought about