A hayride costs $8 per person, and there is a 25% discount for children, students, and senior citizens. If there are (p) people who do not qualify for the discount and (s) people who do qualify, which equation can be used to calculate the revenue (R)?
A R = 8p - 6s
B R = 8p + (0.75)(8)(s)
C R = 8p + 0.75s
D R = 8p + (0.25)(8)(s)