Traveller Company Sells One Product and Uses a Standard Cost

Traveller Company sells one product and uses a standard cost system. Last year the overhead volume variance was zero. Which of the following is correct?

A) Actual variable overhead cost was equal to standard variable overhead cost.
B) Total applied overhead was equal to total actual overhead.
C) The denominator activity was equal to actual activity.
D) The budgeted fixed costs were equal to the applied fixed costs.