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) 30 N
B) 24 N
C) 12 N
D) 6 N
E) 18 N