Graph on a coordinate plane each set of values. Which set of values describes two quantities that are in a proportional relationship?

A(2, 7)(0, 2)(3, 9)

B(1, 5)(2, 7)(3, 9)

C(4, 9)(2, 4.5)(0, 0)

D(1, 3.5)(0, 1)(2, 6)