You are given the following cost and activity information for two particular months at a car wash facility: Month 1: 2,000 cars washed, total cost $8,000, Month 2: 4,000 cars washed, total cost $12,000. Using the high-low method, what is the estimated variable cost per car washed?
A. $1.00 per car.
B. $2.00 per car.
C. $3.00 per car.
D. $4.00 per car.