Bryan is getting trained and licensed to be a truck driver. He only has $350 in his bank account. The training is free but gas costs 13 cents per mile. Write an equation where a is the amount of money in Bryan's bank account and m is the number of miles he travels.
A. a=0.13m−350
B. a=350−13m
C. a=13m−350
D. a=350−0.13m