please help if u can!!

The entry fee to a fun park is $20. Jackson spent a total of 35 at the park. If z represents the number of rides jackson went on, which equation represents the situation and what is the value of z that makes the equation true?

A= 2.50=35
x=14

B= 2.50z=20
x=8

C= 20z+2.50=35
c=2

D= 20+2.50z=35
x=6