Presented Below Is the Production Data for the First Six

Presented below is the production data for the first six months of the year showing the mixed costs incurred by Eunice Company.
$\begin{array}{lll}\text { Month }&\text { Cost }&\text { Units }\\\text { January } & \$ 7,500 & 4,000 \\\text { February } & 13,000 & 7,500 \\\text { March } & 11,500 & 9,000 \\\text { April } & 11,700 & 11,500 \\\text { May } & 13,500 & 12,000 \\\text { June } & 11,850 & 6,000\end{array}$
Eunice Company uses the high-low method to analyze mixed costs.The variable cost per unit is ________.

A) $0.625
B) $0.75
C) $1.25
D) $1.31