Which idea best indicates that one of the purposes of the author of It's Our World, Too!: Young People Who Are Making a Difference is to persuade?

The crowd applauds the students for writing the letter that was read at the football game.
Jesse informs Neto about the harassing comments that are being made by the audience.
Students keep themselves busy constructing floats and preparing for the parade.
Andy makes copies of the students’ letters and ensures that the letters are passed out.