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Mercury is the closest planet to the Sun.

Mercury is the planet that orbits closest to the Sun, making it the first planet in our solar system. Its proximity results in a shorter orbital period compared to other planets.

A) Venus

Venus is the second planet from the Sun, positioned after Mercury in the solar system. While it is often considered Earth's twin due to its similar size and composition, it does not hold the title of being closest to the Sun.

B) Uranium

Uranium is not a planet; it is a chemical element with the symbol U. This option is irrelevant in the context of the question, which asks specifically about planets in relation to their distance from the Sun.

C) Neptune

Neptune is the eighth and farthest planet from the Sun in our solar system. Its great distance from the Sun disqualifies it from being the closest planet, making this option incorrect.

D) Mercury

Mercury is the correct answer, as it is the first planet from the Sun. Its orbit is the shortest of all the planets, completing a revolution around the Sun in just 88 Earth days.

Conclusion

Mercury is definitively the closest planet to the Sun due to its position and orbital characteristics. All other options either misidentify planets or do not fit the criteria of proximity to the Sun, reinforcing that Mercury is the only correct choice.