According to Newton's law of universal gravitation, $F=\frac{Gm\_1m\_2}{r^2}$, which change will increase the gravitational force between two objects?

• A. Increase the distance $r$ between the objects while keeping $m\_1$ and $m\_2$ constant
• B. Decrease both masses $m\_1$ and $m\_2$ while keeping $r$ constant
• C. Decrease the distance $r$ between the objects while keeping $m\_1$ and $m\_2$ constant
• D. Keep $m\_1$, $m\_2$, and $r$ the same but move the objects to a higher altitude above Earth

Answer: (C)