Which equation is modeled by the graph? What is the estimated change in the number of cars in the parking garage for each minute after 8 am?

A. y = -3x + 50; 3 cars per minute

B. y = 3x -50 ; 3 cars per minute

C. y = 4x + 50; 4 cars per minute

D. y = 3x + 50; 3 cars per minute

E. = 3/50; x 3 cars per minute