Jeffrey Spends All of His Income on Warm-Up Suits and Running

Jeffrey spends all of his income on warm-up suits and running shoes,and the price of a pair of shoes is four times the price of a warm-up suit.In order to maximize total utility,Jeffrey should

A) buy four times as many warm-up suits as pairs of running shoes.
B) buy four times as many pairs of running shoes as warm-up suits.
C) buy both items until the marginal utility of a pair of running shoes is four times the marginal utility of a warm-up suit.
D) buy both items until the marginal utility of a warm-up suit is four times the marginal utility of a pair of running shoes.