Economists identify the satisfaction a person derives from the consumption of goods and services as:

A) happiness.
B) usefulness.
C) utility.
D) pleasure.

Economists refer to the satisfaction derived from the consumption of goods and services as utility. It is a term used to describe the amount of satisfaction or pleasure a person gets from consuming a particular good or service. Option A, happiness, is a broader term that encompasses various factors, including personal relationships, emotional well-being, and life satisfaction. Option B, usefulness, is a more practical term that refers to the extent to which a good or service fulfills a specific need or purpose. Option D, pleasure, is a related concept to utility but refers specifically to the positive emotional experience associated with consuming a good or service.