Selma Inc Reported the Following Results from Last Year's Operations

Selma Inc. reported the following results from last year's operations: $\begin{array}{lr}\text { Sales } & \$ 13,800,000 \\\text { Variable expenses } & 9,950,000 \\\text { Contribution margin } & 3,850,000 \\\text { Fixed expenses } & 3,022,000 \\\text { Net operating income } & \$828,000 \\\text { Average operating assets } & \$ 6,000,000 \\\end{array}$ Last year's margin was closest to:

A) 78.1%
B) 6.0%
C) 13.8%
D) 27.9%