Quickly ! which table shows a proportional relationship between x and y?

a. x 7 14 28 35
y 1 2 4 5

b. x 2.5 3 5 6
y 5 6 10 15

c. x 1 2 3 4
y 4 10 12 16

d. x 1 3 4 7
y 2 5 8 14

sorry bout the spaces in them