In Newton's law of universal gravitation, the magnitude of the gravitational force between two point masses is $F=G\frac{m\_1m\_2}{r^2}$. Which factors affect the strength of the gravitational force?

• A. It depends only on the distance $r$ between the objects, not on their masses.
• B. It depends on the masses and increases proportionally with $r^2$.
• C. It depends on the electric charges of the objects and the distance between them.
• D. It depends on the two masses $m\_1$ and $m\_2$ and inversely on the square of the distance $r$ between them.

Answer: (D)