The Following Information Is Available for Electricity Costs for the Last

Multiple Choice

The following information is available for electricity costs for the last six months of the year: $\begin{array}{lll}\text { Month }& \text { Production Volume } &\text { Electricity Costs }\\\text { July } & 1,400 & £ 3,150 \\\text { August } & 2,800 & 5,400 \\\text { September } & 3,200 & 5,700 \\\text { October } & 1,750 & 3,900 \\\text { November } & 1,200 & 2,400 \\\text { December } & 2,100 & 4,050\end{array}$ Using the high-low method, estimated variable cost per unit of production is

A) £1.26.
B) £1.53.
C) £1.65.
D) £1.77.