In applying the high$-$low method to the following data set, what is the unit variable cost?

MonthMilesTotal Cost

January$80,000$$$192,000$

February$50,000160,000$

March$70,000188,000$

April$90,000260,000$

Question $23$ options:

A$)$

$$3\mathrm{.}20$

B$)$

$$2\mathrm{.}88$

C$)$

$$2\mathrm{.}50$

D$)$

Cannot be determined from the information given.