Planet Z-34 Has a Mass Equal to One-Third That of Earth

Multiple Choice

Planet Z-34 has a mass equal to one-third that of Earth and a radius equal to one-third that of Earth. With g representing, as usual, the acceleration due to gravity on the surface of Earth, the acceleration due to gravity on the surface of Z-34 is

A) g/3.
B) 3 g.
C) 6 g.
D) g/9.
E) 9 g.