Which of the following is inversely proportional to the gravitational force between two masses?

A. The mass of each object.

B. The velocities of each object.

C. The distance between each object.

D. The distance between each object squared.

It is D, the distance between each object squared. We get this from solving for the force of gravity, which is

F = G ((m1*m2) / (r^2)).

Here, you can see that the masses of the two objects are divided by their total distance apart from each other (r) squared.