Final answer:
The component of sales-volume variance in the question is Operating-income volume variance, which measures the impact of changes in sales volume on operating income.
Step-by-step explanation:
The component of sales-volume variance that is being asked about in this question is Operating-income volume variance. Sales-volume variance is the difference between the actual units sold and the budgeted units sold, multiplied by the standard profit per unit. The aim of calculating sales-volume variance is to assess the impact of the difference in sales volume on the operating income. Therefore, the correct answer is B) Operating-income volume variance. It is a measure used to determine how the change in the volume of sales has affected the operating income compared to what was budgeted.