Economists Are Able to Determine Total Utility By

Economists are able to determine total utility by:

A) multiplying the marginal utility of the first unit consumed by the number of units consumed.
B) multiplying the marginal utility of the last unit consumed by the number of units consumed.
C) multiplying the marginal utility of the last unit consumed by the unit price.
D) summing up the marginal utilities of each unit consumed.