Concept:Marginal utility is the extra satisfaction gained from consuming one more unit.
It is measured by the slope of the total utility curve.
Explanation:A declining slope of the total utility curve means each additional unit consumed adds less satisfaction than the previous unit.
Thus, marginal utility falls as more units are consumed.
For marginal utility to increase again, the consumer must move back to a smaller quantity consumed.
When he reduces the quantity consumed, the next unit he takes will yield a higher marginal utility.
Increasing consumption would further lower marginal utility.
Stopping or consuming another commodity does not directly raise the marginal utility of the same commodity.
Answer:The consumer will have increasing marginal utility if he reduces the quantity consumed.
Correct option: B. reduces the quantity consumed.