The Wilson family is going to an amusement park for the day. The park charges $15 per vehicle for parking. The cost of each admission ticket is $40. Which equation represents the cost of going to the park, c, for a given amount of family members, f, and a given amount of vehicles, p?
A) f = 15c + 40p
B) f = 40c + 15p
C) c = 15f + 40p
D) c = 40f + 15p