Question

what orbits the sun?
the milky way
the oort cloud
the earth

Explanation:

The Earth is a planet in our solar system that orbits the Sun. The Milky Way is a galaxy, and the Sun is part of it, so the Milky Way does not orbit the Sun. The Oort Cloud is a theoretical cloud of predominantly icy planetesimals believed to surround the Sun at distances ranging from 2,000 to 200,000 AU (solar radii), but it is not an object that "orbits" the Sun in the same sense as a planet.

Answer:

The Earth