The distance, in inches, from the starting position of a swinging pendulum over time, in seconds, is represented by the graph below. When f(x)=0 , the pendulum is at its starting position. When f(x)>0, the pendulum is to the left of its starting position, and when f(x)<0, the pendulum is to the right of its starting position. The function describing this graph is a transformation of the parent cosine function, y=cos(x). Which value best describes the amplitude of the transformed function? A. 3 inches

B. 6 inches

C. 0 inches

D. 1.5 inches