Answer:
C. Every mass exerts a gravitational force on every other mass.
Step-by-step explanation:
Gravitational force is one of the four fundamental forces of nature. It is the force that binds together all the object in the universe. This force is exerted by all the object having mass on another objects having mass. It doesn't matter whether the mass is less or more. With change in mass the amount of force will vary but the gravitational force will still be acting on everything having mass.
The gravitational force between two objects of mass m₁ and m₂ separated by a distance r is given as:

G = Universal gravitational constant