A softball team is ordering pizza to eat after their tournament. They plan to order cheese pizzas that cost $6 each and four-topping pizzas that cost $10 each.

They order c cheese pizzas and f four-topping pizzas.

Which expression represents the total cost of all of the pizzas they order?
A) 6 + 10
B) C + F
C) 6c + 10f
D) 6f + 10c