The equation y= 0.25x + 50 gives the cost y of renting a car if the car is driven x miles.

Which statement is true ?

A. For every mile the car is driven, the cost increases by $0.25.

B. For every mile the car is driven, the cost decreases by $0.25.

C. For every mile the car is driven, the cost increases by $50.

D. For every mile the car is driven, the cost decreases by $50.