Select the table that represents a linear function. (Graph them if necessary.)

A.
x 0 1 2 3
y 5 10 15 20

B.
x 0 1 2 3
y 1 2 4 8

C.
x 0 1 2 3
y 0 1 0 3

D.
x 0 1 2 3
y 4 3 1 2