Which of the Following Is an Example of Utilizing Capacity

Which of the following is an example of utilizing capacity effectively?

A) Building a plant large enough so that production can be increased as demand increases.
B) Hiring extra temporary employees to work extended hours during Christmas season at a retail store.
C) Having all employees of a donut shop work a regular 8-hour shift every day.
D) A caterer having a limited number of chefs working during the week and on weekends.
E) An airline selling 20% more tickets for a flight than their airplane has available seats.