A Hypothetical Planet Has a Mass of One-Half That of the Earth

Multiple Choice

A hypothetical planet has a mass of one-half that of the earth and a radius of twice that of the earth.What is the free-fall acceleration on the planet in terms of g,the free-fall acceleration at the surface of the earth?

A) g
B) g/2
C) g/4
D) g/8
E) g/16