Answer:
D
Explanation:
The formula for the gravitation force is
Fg = G * m1 * m1 / r^2
You have to realize that nothing but the mass changes and that will make Fg change.
So G remains constant.
r remains constant
somehow m1 and m2 between them increase by a factor of 4. It does not tell how that increase takes place. It just does.
So m1 could become 4*m1
or
M2 could become 4*m2
or
m1 * m2 becomes 4 * m1 * m2
or
m1 and m2 could both increase by a factor of 2
or
any number of other combinations are possible. The point is that m1 * m2 must somehow between them make the new mass = 4 m1 * m2
Then the force Fg will increase by a factor of F. The answer is D
