John looks like a professional bodybuilder. He weighs 210 pounds and stands six feet tall, which is the size of an NFL linebacker. John looks huge when he enters the room. Years of gym time have clearly paid off in spades. Which of the following, if true, weakens the argument? ["John's father, brothers, and male cousins all look like professional bodybuilders, and none of them have ever worked out.", 'John works out five times every week.', 'John weighed considerably less before he started working out.', 'The average professional bodybuilder is considerably heavier and taller than the average NFL linebacker.']