Which of the Following Statements Is True of Variable Overhead

Which of the following statements is true of variable overhead costs?

A) All the decisions determining the level of variable overhead costs are made at the start of a budget period.
B) Planning of variable overhead costs includes choosing the appropriate level of capacity.
C) Activities which add value are of least relevance while planning variable overhead costs.
D) The level of variable overhead costs incurred in a period is mainly determined by day-to-day operating decisions.