Anne has chosen how many bagels and how many units of cream cheese she would buy this month. She has $20 to spend on these two goods. Suppose that her chosen combination, the marginal benefit per dollar for bagels is $6, and her marginal benefit per dollar for cream cheese is $10. By reallocating one dollar from ________ to ________ she can add ________ to her benefit.

a.

bagels; cream cheese; $4

b.

cream cheese; bagels; $10

c.

cream cheese; bagels; $6

d.

bagels; cream cheese; $10