About 90% of all stars are in the main sequence including our very own sun. They are the stars that are going through nuclear fusion, turning hydrogen atoms into helium.
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The correct option is 2)Argumentative: In an argumentative text you discuss a subject or problem from different perspectives. At this time, Anna Quindlen the author of "A quilt of a country" states that although the great diversity found in America creates a lot of problems in the cities, it also serves as a quality to make America more special, and for this she uses a literature metaphor: Quilt, to put into other perspective her intention in the text. Although the author recurs to real episodes happend in America It's not autobiografical because doesn't talk about a particular person's life. It's not fictional because most of information is based on real facts, although uses literature metaphors to make the idea clearer.
The main idea of the passage above from Cotton Mather's "The Wonders of the Invisible World" is to justify the outcome of the trials. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.