Football is unsafe regardless of the precautions undertaken or rule changes implemented. Repeated head trauma always leads to long-term head injury. Parents are already refusing to allow their children to play youth football. Eventually, nobody will want to play football due to safety concerns. Ttherefore, the NFL will dramatically decline in popularity. Which of the following, if true, most weakens the argument? ['Removing helmets would reduce head collisions by fifty percent.', "The NFL's popularity will naturally decline as tastes change, like the decline in popularity of boxing and horse racing.", 'Scientific studies of brain trauma are inconclusive as to long-term effects.', 'No matter the danger, there will always be players willing to sign waivers and play.']