The gravitational force between two objects increases as mass
a. decreases or distance decreases.

b. decreases or distance increases.

c. increases or distance decreases.

d. increases or distance increases.

F=g(m1*m2)/r^2
gravitational force is directly proportional to product of masses and inversely proportional to square of distance between them.so consequently mass should increase and distance should decrease

The gravitational force between two objects increases as mass increases or distance decreases. This will make the correct answer C. 

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