Ruxandra's Marginal Utility from Eating Her Fourth Steak in a Month

Multiple Choice

Ruxandra's marginal utility from eating her fourth steak in a month is 20 utils. Her marginal utility from eating her fifth salmon fillet is 30 utils. What should Ruxandra do if the current price of a steak is $10 and the price of a salmon fillet is $15?

A) increase the quantity of steak that she consumes
B) increase the quantity of salmon that she consumes
C) nothing because her utility is as high as possible
D) decrease the quantity that she consumes of both goods