Answer :
Cambridge English Dictionary defines "irony" as "Irony is a style of writing in which there is a noticeable, often humorous, difference between what is said and the intended meaning."
C. Randy's environmental science project was a large poster of a tree with a caption that read: "Save the Trees, Go Paperless!"
Option C is an example of irony because Randy is appealing to people to save the trees and go paperless when his own poster has been made on a large sheet of paper.
