A relevant cost is:. a. the foregone benefit of choosing to do one thing instead of another.
b. a cost that differs across decision alternatives.
c. a cost that has already been incurred.
d. a cost that is the same regardless of the alternative the manager chooses.

b. A cost that differs across decision alternatives.

Explanation:

When managers make business decisions, some costs are incurred when such decisions are made. They are called relevant cost. The main purpose of relevant cost is to avoid duplication of data that are not necessary, which could further make business decisions complicated.

Example of relevant cost is when a business or an organization checks whether or not to sell a business unit. The cost incurred in such decision is called relevant cost.

answer; read and consider the content of the items;

answermarginal cost;