To join a video rental club, a member pays an initial fee plus an additional monthly cost. The equation below describes the relationship between x, the number of months a member rents videos, and y, the total cost in dollars. y=15+20x

What is the meaning of the rate of change for the equation?

A.
It means the cost per month is $15.

B.
It means the initial fee is $20.

C.
It means the cost per month is $20.

D.
It means the initial fee is $15.