The law of diminishing marginal utility states:

The correct answer is: Your utility grows at a slower and slower rate as you consume more and more units of a good. The law of diminishing marginal utility is a fundamental principle in economics that explains how the satisfaction or usefulness that a person gets from consuming additional units of a good or service decreases as they consume more of it. In other words, the more you have of something, the less you will enjoy or benefit from having more of it. For example, if you are hungry and you eat one slice of pizza, you will probably enjoy it very much. But if you keep eating more and more slices of pizza, your enjoyment will start to decrease as you become full. Eventually, you may not want any more pizza at all, even if there is still some left. This principle is important because it helps explain why people make certain choices about what to buy and consume. As the satisfaction from consuming each additional unit of a good decreases, people will be willing to pay less for each additional unit. This is why demand curves slope downward - people are willing to buy more of a good at lower prices.