The law of diminishing returns results in:

A) an eventually rising marginal product curve.
B) a total product curve that eventually increases at a decreasing rate.
C) an eventually falling marginal cost curve.
D) a total product curve that rises indefinitely.

The law of diminishing returns states that as additional units of a variable input are added to a fixed input, the marginal product of the variable input will eventually decrease. This results in a total product curve that eventually increases at a decreasing rate, indicating diminishing returns. Therefore, option B is the correct choice. Option A is incorrect as the marginal product curve will eventually decrease as a result of the law of diminishing returns. Option C is incorrect as the law of diminishing returns does not directly impact the marginal cost curve. Option D is incorrect as the total product curve will eventually flatten out due to diminishing returns.