Newton's law of gravitation is called the universal law of gravitation because:
A
it is applicable to all particles and members of the solar family
C
it is always valid for forces of attraction
D
it is applicable for all masses at all distances, independent of the medium
Correct option is C. it is applicable for all masses at all distances, independent of the medium
Newtons law of gravitation is called the universal law of gravitation because it is applicable for all masses at all distances, independent of the medium.
For two masses $$m_1$$ and $$m_2$$ placed at a distance $$d$$, the gravitational force between them will always be given by:
$$F_g=G\dfrac{m_1m_2}{d^2}$$
That's why it is a "universal" law.