Barb Campbell owns an entertainment company which has increased both its profits and revenues over an extended period of time. Barb's firm is experiencing:

sustained growth

Explanation:

Based on this information it seems that Barb's firm is experiencing sustained growth. This term refers to the realistically attainable amount of growth that a company can have without running into problems. If a business grows way too fast it will not be able to fund that growth, but if they do not grow enough then they will amass debt and fail. Sustainable Growth is usually the goal for new companies.

income increases, enabling consumers to buy more goods and services. ( c.)

answer; is usually (less than) the socially optimal level of consumption;