Help pls The ordered pairs (2,30) , (2.5,37.5) and (3,45) are points on a line that show a proportional relationship between the total distance bicycled after a certain number of hours. What ordered pair on that graph shows the unit rate? What does the unit rate represent?

A. (2,30); it represents a distance of 30 miles.

B. (15,1); it represents bicycling at 15 miles per hour.

C. (1,15); it represents bicycling at 15 miles per hour.

D. (0,0); it represents the initial distance before bicycling Students anywhere on this slider​