A Spherically Symmetric Planet Has Four Times the Earth's Mass

Multiple Choice

A spherically symmetric planet has four times the earth's mass and twice its radius. If a jar of peanut butter weighs 12 N on the surface of the Earth, how much would it weigh on the surface of
This planet?

A) 6.0 N
B) 36 N
C) 24 N
D) 3.0 N
E) 12 N