-What Is the Law of Diminishing Marginal Utility

-What is the law of diminishing marginal utility?

A) The amount of additional utility decreases as successive units of a product is consumed.
B) Marginal utility increases quickly at first,but more slowly later.
C) Total utility declines at first,but after some point starts to increase.
D) While total utility rises with the consumption of additional units,marginal utility is always constant.