Answer:
If you could link it that would be easier.
Explanation:
Its usually written as the first sentence of the paragraph (although its not necessary but preferred) It basically includes the main idea or the topic of the paragraph (doesn't have to be word for word), and states the main points of the paragraph briefly.
We must know the paragraph first u know
C because it can tell how to add 1-1 for the math tho you might want to divide