Individuals Achieve Maximum Utility in the Allocation of Their Time

Individuals achieve maximum utility in the allocation of their time when _____

A) any change in their use of time reduces their total satisfaction.
B) they consciously and carefully weigh the expected marginal utilities per unit.
C) they consciously and carefully weigh the actual marginal utilities per unit of time spent in each activity.
D) the expected average utility of each activity is equal.
E) people make a concerted effort to measure satisfaction.