Answer: C) Gravitational attraction is inversely proportional to distance.
Explanation:
Gravitational force of attraction exists between any two bodies having mass.
It depends on the mass of two bodies and distance between them.
[tex]F = G \frac{M_1 M_2}{d^2}[/tex]
where [tex]M_1[/tex] and [tex]M_2[/tex] are masses and d is the distance between them.
The graph is based in the above relation. As we can understand, gravitational force is directly proportional to the masses and inversely proportional to the square of the distance between them.