Hailey is doing a fundraiser in which she will swim laps in a pool for money. She has gotten donations from friends and neighbors that amount to $5 per lap. If her parents gave her $20 to get the fundraising started, which equation can be use to determine the total amount of money Hailey will raise, m, as determined by the number of laps she is able to swim, s?
A. s = 20 + 5m
B . m = 20 + 5s
C. s = 25m
D. m = 25s

I think the answer is B, but I am doubting myself. Can anyone confirm please

Question

Hailey is doing a fundraiser in which she will swim laps in a pool for money.  She has gotten donations from friends and neighbors that amount to $5 per lap.  If her parents gave her $20 to get the fundraising started, which equation can be use to determine the total amount of money Hailey will raise, m, as determined by the number of laps she is able to swim, s?
A.  s = 20 + 5m
B . m = 20 + 5s
C.  s = 25m
D.  m = 25s

I think the answer is B, but I am doubting myself.  Can anyone confirm please