Which of these descriptions indicate that the writer's purpose is to persuade readers?
A an instructional book describing rules on how to operate a particular laptop
B a note written by a 13-year-old boy to his parents giving different reasons why they should increase his allowance
C the short story “Legends of Sleepy Hollow,” in which a headless horseman haunts the local townsfolk of Sleepy Hollow
Dan essay about the different techniques used in regulating air and water pollution