Glen owns a ranch in Maricopa. He has a "fresh" horse that has not been ridden in over a year. Donna tells Glen that she can "break" the horse. Glen warns her that the horse does not like adults and has not been ridden in over a year. As such, he tells her that horse could buck her off. He makes her sign a waiver, assuming the risk in writing that horse riding is an inherently dangerous activity. She decides to try to "break" the horse anyway. Which of the following is Glen's best defense against Donna?

Group of answer choices

fraud

negligence

assumption of the risk

comparative fault