Drive with Us is an automobile retailer and pays floor plan financing to finance the cars they hold in inventory. If the interest rate on their floor plan financing increases from 4 to 5 percent, Drive with Us's expected marginal cost from holding additional cars in inventory will shift ________ and the profit-maximizing number of cars to hold in inventory will ________.

A) downward; increase
B) upward; increase
C) upward; decrease
D) downward; decrease

C) upward; decrease