Answer: A. cost driver rate and the actual cost driver volume
Explanation:
When using activity-based costing, the cost for an activity is based on the cost driver rate, which is the cost per unit of the activity, and the actual cost driver volume which is how many units was used in the activity.
For instance, if the cost driver rate for marketing is $8 per unit and 50 units were produced - actual cost driver volume- then the cost of marketing would be:
= 8 * 50
= $400
