The orbiting of the moon around the Earth can be explained by

a. the universal gravitational law.

b. Newton's first law.

c. the law of energy conservation.

d. Pascal's principle.

When talking about orbits, it would have to be a mixture of both A. and B. since Newton's first law, gravity plays a huge part in an orbit. However, the universal gravitation law also tells us the relationship between two massive objects in orbit. But to choose only one, it would have to be B. Newton's first law