The Marginal Cost of an Activity Is The

The marginal cost of an activity is the:

A) change in the total cost of the activity that results from carrying out an additional unit of the activity.
B) the total cost of the activity divided by the change in the level of the activity.
C) the total cost of the activity divided by the level of the activity.
D) change in the level of the activity divided by the change in the cost of the activity.