Randy is deciding which cell phone plan is the best deal for him to buy. Super Cell charges a monthly fee of $15 and also charges $0.05 per call. Which equation represents the cost of service at Super Cell? (Use M as the monthly charge, in dollars, and C as the number of calls placed.)


A
M = .05 + 15C

B
M = .05C + 15

C
M = .05 + C + 15

D
M = .05C x 15