PLEASE HELP WILL MARK BRAINLIEST!! John is at the beach and he wants to rent a jet ski and beach chairs for the day. The following functions represent the cost for each, where J(x) represents the cost of the jetski and B(x) represents the cost of the beach chairs.

J(x) = 30x + 7
B(x) = 5x + 3

Which of the following functions could represent his total cost, C(x), for the rentals at the beach?

A: C(x) = 35x + 10
B: C(x) = 25x + 4
C: C(x) = 35x + 4
D: C(x) = 25x + 10