Which evidence best supports the claim that students at Williams Middle School will benefit from a week at wilderness camp?

Eighty percent of other local middle schools have attended wilderness camp, so it is only fair that all go.
Studies show that students retain sixty-five percent more knowledge after a hands-on learning experience.
Teachers and students agree that they get tired of the classroom environment and need a break.
Advertising brochures printed by the camp promise that students will have a wonderful week.