Answer: Option (C) is correct.
Explanation:
Correct option: is equal to the sum of the marginal utilities of all units consumed.
Total utility refers to the aggregate satisfaction that a person can get from consuming the units of goods and services. Each consumer can get different utilities from each unit or we can say that every unit gives him/her a different level of utility.
These individual utilities from units of the goods are known as marginal utility.
Marginal utility also refers to the utility that a consumer can get from an additional unit consumed.
So, total utility is simply the sum marginal utilities of all the units that a consumer consumed.