Which of the following planets is closest to the Sun ?

Correct option is D

Mercury is the planet closest to the Sun. It has an average distance of about 57.9 million kilometers (36 million miles) from the Sun.
Important Key Points:
1. Mercury has a very thin atmosphere, leading to extreme temperature variations.
2. It completes one orbit around the Sun in about 88 Earth days.
3. Mercury is the smallest planet in the Solar System.
4. The surface of Mercury is heavily cratered, similar to the Moon.
Information Booster:
 Earth: Third planet from the Sun, known for supporting life.
 Moon: Not a planet, but Earth's natural satellite.
 Mars: Fourth planet from the Sun, known as the Red Planet.