Question

gravity and magnetism
mass and distance

Explanation:

To solve this, we analyze the options in the context of gravitational force (from Physics, a Natural Science subfield):

• Gravity and magnetism: Magnetism is a separate force (electromagnetic), not directly related to what determines gravitational strength.
• Mass and distance: Newton’s law of gravitation ($F = G\frac{m_1m_2}{r^2}$) shows gravitational force depends on the masses of objects ($m_1, m_2$) and the distance ($r$) between them.

The question relates to factors affecting gravitational force. Newton’s law of gravitation states gravity depends on mass (of objects) and distance (between them). "Gravity and magnetism" is incorrect (magnetism is unrelated to gravitational strength). "Mass and distance" matches the physics of gravity.

Answer:

mass and distance