Select the equation and solution for the problem. Let x represent the unknown number A total of 21 people on a sports team are riding in 3 vans. How many people are riding in each van if each van is carrying the same number of people?

A. x+3=21 x=18
B. x-3=21 x=24
C. 3x =21 x=7
D. 21x =21 x= 1/7