Concept:The planets are arranged in increasing distance from the Sun, so the nearest planet is the first one in this order.
Explanation:Mercury is the closest planet to the Sun in the solar system.
It has the smallest orbital radius among all the planets.
After Mercury, the next planets in order are Venus, Earth, and Mars.
Earth is the third planet from the Sun, while Mars is the fourth planet.
Pluto, though once considered the ninth planet, lies much farther away from the Sun.
Since Mercury’s orbit is nearest to the Sun, Mercury is the correct option.
No other option has an orbit that lies closer to the Sun than Mercury’s orbit.
Answer:D. Mercury