In the xy-plane, the point (p,r) lies on the line with equation y=x+b, where b is a constant. The point with coordinates (2p,5r) lies on the line with equation y=2x+b. If p≠0, what is the value of r p ?
A) 2 5
B) 3 4
C) 4 3
D) 5 2 ​