The Figure Above Shows Some of a Firm's Cost Curves

The figure above shows some of a firm's cost curves and its marginal revenue curve.
-The firm in the figure above has a total cost equal to ________ .

A) $5.10 × 10
B) $8.00 × 10
C) ($5.10 - $8.00) × 10
D) ($8.00 - $5.10) × 10
E) None of the above answers are correct because more information is needed.