Concept:The hottest planet is determined by surface temperature, which depends on distance from the Sun and the presence of a thick atmosphere.
Explanation:Venus is the second planet from the Sun, but it has a dense carbon dioxide atmosphere.
This atmosphere traps heat through the runaway greenhouse effect, causing surface temperatures over 460°C.
Mercury is closer to the Sun but lacks an atmosphere, so it cannot hold heat and becomes extremely cold at night.
Mars and Pluto are farther from the Sun and remain much colder.
Hence, Venus is the hottest planet in our solar system.
Answer:A. Venus