The price of gasoline at 4 different gas stations is shown in the table below. Which gas station charges the least amount per gallon of gasoline?
Gas station K's amount of gas is 15 for $36.
Gas station L's amount of gas is 10 for $23.50.
Gas station M's amount of gas is 8 for $20.
Gas station N's amount of gas is 20 for $51.

A. Gas station K

B. Gas station L

C. Gas station M

D. Gas station N