Which of the Following Is Correct in Reference to the Law

Which of the following is correct in reference to the law of diminishing marginal utility?

A) The amount of additional utility decreases as successive units of a product are consumed.
B) Marginal utility increases at first,but after some point starts to decline.
C) Total utility declines at first,but after some point starts to increase.
D) Marginal utility increases as more of a product is consumed.