On average, corporations that encourage frequent social events in the workplace show higher profits than those that rarely do. This suggests that the EZ Corporation could boost its profits by having more staff parties during business hours. Which one of the following, if true, most weakens the argument above? ['Frequent social events in a corporate workplace leave employees with less time to perform their assigned duties than they would otherwise have.', 'The great majority of corporations that encourage frequent social events in the workplace do so at least in part because they are already earning above-average profits.', 'The EZ Corporation already earns above average profits, and it almost never brings play into the workplace.', 'Corporations that have frequent staff parties after business hours sometimes have higher profits than do corporations that have frequent staff parties during business hours.']