Answer the Following Questions Using the Information Below

Answer the following questions using the information below:
Safiya's Custom Jewelry sells a single product. 700 units were sold resulting in $7,000 of sales revenue, $2,800 of variable costs, and $1,200 of fixed costs.
-Contribution margin per unit is:

A) $6.00
B) $4.29
C) $4.00
D) None of these answers are correct.