Final answer:
The computation of the variable-overhead spending variance uses the actual variable overhead cost.
Thus, the correct option is A.
Step-by-step explanation:
The computation of the variable-overhead spending variance uses the actual variable overhead cost, which is option (a) Actual Variable.
In the calculation of the variable-overhead spending variance, the formula used is:
Variable-Overhead Spending Variance = Actual Variable Overhead Cost - (Actual Hours x Budgeted Variable Overhead Rate)
Therefore, the correct answer is option (a) Actual Variable.