Which of the following tables represents a proportional relationship?
A.
x 2 3 4 5
y 3 6 9 12

B.
x 2 4 6 8
y 3 4 5 6

C.
x 1 4 7 10
y 0 3 6 9

D.
x 2 4 6 8
y 3 6 9 12