Answer:
B. 30,000 units of activity.
Step-by-step explanation:
Data provided in the question
Planned sales unit = 24,000 units
Actual sales units = 30,000 units
Based on the given information, the appropriate comparison is made when the planned sales units is compared with the actual sales units i.e 24,000 units with 30,000 units
So the budget should be based on 30,000 units of activity as it reflects the actual sales units