8. Ronny's Rentals offers car rentals for a base of \( \$ 20 , \) with an additional \( \$ 45 \) charged for each day of the rental. Carol's Cars offers car rentals for a base of \( \$ 35 , \) with an additional \( \$ 40 \) charged for each day of the rental. Which of the following sets of functions represent this scenario? 

A. Ronny's Rentals: \( y = 20 - 45 x ; \) 

Carol's Cars: \( y = 35 - 40 x \) 

B. Ronny's Rentals: \( y = 65 x ; \) Carol's Cars: \( y = 75 x \) 

C. Ronny's Rentals: \( y = 20 x + 45 \) ; Carol's Cars: \( y = 40 x + 35 \) 

D. Ronny's Rentals: \( y = 20 + 45 x \) ; Carol's Cars: \( y = 35 + 40 x\)