in need help ASAP!! 25 points!

Kami and her mother offer tours of a nearby canyon. They charge a $50 base rate plus $10 per person for a 2.5 hour tour. Which equation represents A, the amount they make to tour p people thorough the canyon?

A. 2.5p+50=10A

B. 10p+50=A

C. 2.5p=50=A

D. 10/p+50=A