Which table shows a proportional relationship?

r 5 10 15 20 25
s 1 2 3 4 5


b 0 3 5 7 9
c 0 4 8 12 16


p 1 3 5 7 9
q 6 8 10 12 14


x 1 2 3 4 5
y 4 7 10 13 16