If the capital stock is fixed and something happens to raise the marginal product of capital for any given quantity of capital, then the real rental price of capital will:

B) rise

Explanation:

The real rental price of capital refers to the cost of borrowing capital which is the interest payment on the capital less the capital gains made. As a result it is equal to the marginal product of capital which shows how much extra, a unit of capital enables the entity to produce.

Therefore, if marginal product of capital rises, as is the case in the question, so will the real rental price of capital.

c.

explanation:

regressive tax taxes the poor and less of the wealthy. this the rich get richer and the poor get more poor. this would create a large wealth gap.