Answer:
1. Topic.
2. Main idea.
3. All three? I don't understand what you were trying to say in the question. If you meant what to do to look for the main idea of a text, all of the above should be correct.
Explanation:
Answer:If im not mistaken its"And so let freedom ring from the prodigious hilltops of New Hampshire. Let freedom ring from the mighty mountains of New York. Let freedom ring from the heightening Alleghenies of Pennsylvania"
Explanation: