The correct answer is option 2 - Eight. There are a total of eight planets that revolve around the sun in our solar system. These planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The first four are known as the inner planets, while the last four are the outer planets. It is important to note that Pluto was previously considered the ninth planet, but it was reclassified as a dwarf planet in 2006. Therefore, the total number of planets revolving around the sun is currently eight.