Concept:Venus is the hottest planet in the solar system due to its thick atmosphere and greenhouse effect.
Explanation:Mercury is closer to the Sun, but it has almost no atmosphere to trap heat.
Venus has a dense atmosphere made mostly of carbon dioxide, which traps heat very effectively.
This strong greenhouse effect makes Venus hotter than Mercury.
The average surface temperature of Venus is about
465∘C, which is higher than that of any other planet.
Therefore, among the given planets, Venus is the hottest.
Answer:A. Venus