The equation is a scientific law, Newton's Law of Gravity,
![F =(GMm)/(r^2)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/zst7op2561ioiot4u4zqy7lhwy6zv90vlo.png)
This is a pretty bad question. Newton's Law of Gravity is a mathematical model of gravitation, originally a theory, verified by observation, and now superseded by the General Theory of Relativity.
C is probably the best answer to this poor question.