A convenience store manager noticed that a cooler which had been stocked with only a cola product and an iced-tea product had 15 colas left at the end of the day but only 3 iced-tea beverages. As a result, the manager reasoned that he should increase the amount of iced tea and decrease the amount of cola he ordered from the distributor. Which of the following, if true, would most strengthen the manager's rationale for ordering more iced tea and less cola? ['On the subsequent day, the remaining three iced tea beverages all sold within the first hour after the store opened.', 'The cooler in question is the only place in the store where the cola and iced tea beverages are stocked.', 'At the beginning of the day, the cooler was stocked with at least as many of the iced tea beverages as of the cola beverages.', 'During that week, a special "buy one, get one free" sale was in effect for the cola beverage.']