Assume MUc and MUd represent the marginal utilities that Alyssa receives from the consumption of products C and D, respectively. Given a fixed budget, Alyssa could increase her total utility by spending more on C and less on D if initially: a. MU_d < MU_c
b. MU_c/P_c < MU_d/P_d
c. MU_c/P_c > MU_d/P_d
d. MU_c > MU_d

c

Explanation:

Marginal utility is the additional satisfaction received from consuming an additional unit of a good or service. Marginal utility is the additional utility derived from consuming one more unit of a good. the consumption decision is to consume more units of a good that gives the higher utility per good.

An example of marginal utility :  Imagine a traveller arriving from the desert where he hadn't had a drink of water in days .he is offered his first glass of water. the first cup of water he drinks would give him the highest utility. As more and more cups of water is drank, marginal utility decreases. At the point where he is fully satisfied, he stops drinking water and marginal utility becomes zero.

The total utility of a consumer can be increased by consuming more of the good that has a higher marginal utility  per price

Marginal utility per price = marginal utility / price of the good

For example, the marginal utility of consuming good C is 50 utils and the price of C is $10 and the marginal utility of consuming good D is 100 utils and the price of D is $50

Marginal utility per price for good C =50 / 10 = 5

Marginal utility per price for good D = 100 / 50 = 2

the consumer should consume more of good C and less of good D