Supporting details can do all of the enlisted options except introduce the main idea. Supporting details are there to support the main idea, so of course they cannot introduce it. They are the result of the main idea, not its creator.
Answer:
<h2>I think its
D tell me if i am wrong ( if i am sorry...)</h2>
Explanation:
B, because there is quotations and you have to start a new line when someone else is talking.
react by someone's opinion make it positive make it easy to communicate without any hesitation