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?
(A): This is irrelevant.
(B): This actually weakens the manager's rationale. If there were prizes on offer for buying the iced-tea, then this, rather than real demand, could have pushed up the sales of iced tea.
(C): Correct. If there were an equal number of iced teas and colas to begin with, then a smaller number of iced teas being left at the end of the day points to greater demand for iced tea.
(D): This is irrelevant.
(E): This does strengthen the rationale, but C is better and more conclusive.