ASAP PLEASE PLEASE!

Richard is consuming X and Y so that he is spending his entire income and marginal utility over price ratio for good X is 6 and marginal utility over price ratio for good Y is 10. To maximize utility, he should

Select one:

a. consume less of both X and Y.

b. continue to consume the same amount of X and Y since he is already maximizing utility.

c. consume more X and less Y.

d. consume less X and more Y.