Cassius Corporation has provided the following contribution format income statement. Assume that the following information is within the relevant range.

Sales (7,000 units) $210,000
Variable expenses 136,500
Contribution margin 73,500
Fixed expenses 67,200
Net operating income $6,300
The number of units that must be sold to achieve a target profit of $31,500 is closest to:

A. 16,400 units
B. 42,000 units
C. 35,000 units
D. 9,400 units