The Carolina Products Company has completed the flexible budget analysis for the 2nd​ quarter, which is as given below. Actual Results Flexible Budget Variance Flexible Budget Sales Volume Variance Static Budget ​Units/Volume 12 comma 840 0 12 comma 840 840 F 12 comma 000 Sales Revenue $ 62 comma 800 $ 1 comma 230 U $ 64 comma 030 $ 4 comma 030 F $ 60 comma 000 Variable Expenses 27 comma 570 590 U 26 comma 980 $ 1 comma 700 U 25 comma 280 Contribution Margin $ 35 comma 230 $ 1 comma 820 U $ 37 comma 050 $ 2 comma 330 F $ 34 comma 720 Fixed Expenses 34 comma 230 180 U 34 comma 050 $ 0 34 comma 050 Operating​ Income/(loss) $ 1 comma 000 $ 2 comma 000 U $ 3 comma 000 $ 2 comma 330 F $ 670 Which of the following would be a correct interpretation of the sales volume variance for sales​ revenues?

A.

increase in fixed costs

B.

increase in sales volume

C.

increase in variable cost per unit

D.

increase in sales price per unit