She began The Outsiders at the age of fifteen, inspired by her frustration with the social divisions in her high school and the lack of realistic fiction for high .
Answer:
1) semicolon
2) comma
3) semicolon
Explanation:
semicolons are used to separate two independent clauses. Independent clauses are phrases that make sense on their own. The comma is needed in #2 because the phrases don't make sense on their own. In that case, a semicolon wouldn't work there.
