a consumer should increase her consumption of good X relativ

a consumer should increase her consumption of good X relative to good Y if

The marginal benefit per dollar spent on good x is greater than marginal benefit per dollar spent on good y

The marginal benefit per dollar spent on good x is smaller than marginal benefit per dollar spent on good y

The marginal benefit per dollar spent on good x is the same as the marginal benefit per dollar spent on good y

None of these

Solution

Consumption of good X should increase relative to consumption of good Y, only if the marginal benefit per dollar spent on good X (i.e., marginal utility of good X divided by price of good X) is greater than the marginal benefit per dollar spent on good Y (i.e., marginal utility of good Y divided by price of good Y).

So, the correct answer is an option (a).