Water Is Essential to Life,while Diamonds Are Not

Multiple Choice

Water is essential to life,while diamonds are not.However,water is cheap and diamonds are expensive.This paradox can be resolved by focusing on _____

A) total utility rather than average utility.
B) average utility rather than marginal utility.
C) marginal utility rather than total utility.
D) total utility rather than marginal utility.
E) average utility rather than total utility.