Many teens enjoy visiting the mall after school. Because it is the only indisputable statement in the choices.
"The only reason people like malls is the air conditioning." is not a fact because it can be disputed. If it was the true case, people would just sit at malls without buying anything
"There are too many shoe stores at the mall."-"too many" is difficult to explain and so it can be disputed
"Shopping is every teenager’s favorite activity." Many teenagers love shopping but every one them has shopping has their favorite activity.
