Peter uses the equation y= 13/4 x to model the number of miles that he has walked in x hours. Which statement is true about the proportional relationship that is modeled by Peter’s equation?

A. Peter walks at a rate of 4/13 miles per hour.
B. Peter walks at a rate of 4 miles per hour.
C Peter walks at a rate of 13/4 miles per hour.
D. Peter walks at a rate of 13 miles per hour.