Two Point Masses M and M Are Separated by a Distance

Multiple Choice

Two point masses m and M are separated by a distance d. If the separation d remains fixed and the masses are increased to the values 3m and 3M respectively, how does the gravitational force between them change?

A) The force will be one-third as great.
B) The force will be one-ninth as great.
C) The force will be three times as great.
D) The force will be nine times as great.
E) It is impossible to determine without knowing the numerical values of m, M, and d.