What is theme, and dont give me googles definition i dont understand it

Respect for the environment means a: loving trees and animals b: not drinking out of streams c: making as little impact as possible on wilderness areas d: only using resources that are high in supply

Those are books that need to be returned to the library what is the antecedent of the pronoun those

The speech barbara jordan gave at richard nixon’s impeachment hearing “ lead to nixon’s resignation over the watergate scandal and won jordan national acclaim for her rhetoric, intellect and integrity.” what was she asked to deliver two years later?