The correct answer is: C. (A) is true, but (R) is false.
Assertion (A) is true. The law of diminishing marginal utility states that as a consumer consumes more of a good, the additional satisfaction or utility gained from each additional unit of consumption declines. This means that the marginal utility of a good will eventually decrease as
the consumer consumes more of it.Reason (R) is false. Deviation from the situation where marginal utility is equal to price does not necessarily lead to a reduction in maximum utility. For example, if a consumer is consuming a good at a point where marginal utility is greater than price, they could increase their utility by consuming more of the good. However, if a consumer is consuming a good at a point where marginal utility is less than price, they could increase their utility by consuming less of the good.
In conclusion, the assertion is true, but the reason is false.