Answer the following question given this paragraph: 

The four planets closest to the Sun - Mercury, Venus, Earth, and Mars - are the inner planets . They are similar to Earth. All are solid, dense, and rocky. None of the inner planets has rings. Compared to the outer planets, the inner planets are small. They have shorter orbits around the Sun and they spin more slowly. Venus spins backwards and spins the slowest of all the planets.


Q: Which planet is closest to the sun?

 Choices:

- Earth

- Jupiter

- Venus

- mercury

A:
mercury
