Concept:The planets in our solar system are arranged in order of their distance from the sun.
The closest planet to the sun is the first planet in that order.
Explanation:The correct order of the first four planets from the sun is: Mercury, Venus, Earth, and Mars.
Mercury orbits the sun at an average distance of about
57.9 million kilometres.
This is much closer than Venus, Earth, or Mars.
Earth is the third planet from the sun, so option A is not correct.
Mars is the fourth planet from the sun, so option D is not correct.
Pluto was once called the ninth planet, but it is now classified as a dwarf planet and is very far from the sun.
Therefore, among the given options, Mercury is the nearest planet to the sun.
Answer:B. Mercury