What Does the Law of Diminishing Marginal Utility State

What does the law of diminishing marginal utility state?

A) Eventually total utility falls as more of a good is consumed, other things constant.
B) The extra satisfaction from consuming a good, decreases as more of a good is consumed, other things constant.
C) The extra satisfaction from consuming a good, increases slowly as more of a good is consumed, other things constant.
D) When the extra satisfaction from consuming a good becomes negative, total utility starts falling, other things constant.