The correct answer is: B. Venus
Venus has a strong greenhouse effect, whose surface temperature averages 480oC (900oF). This is due to the thick atmosphere of carbon dioxide, which traps heat. The atmosphere of Venus is also very dense, which makes it difficult for heat to escape.
Earth also has a greenhouse effect, but it is much weaker than that of Venus. This is because Earth’s atmosphere is composed of different gases, including nitrogen and oxygen, which do not trap heat as effectively as carbon dioxide.
Mars has a very thin atmosphere, which means that it does not have a strong greenhouse effect. The surface temperature of Mars averages -63oC (-81oF).
Pluto is a dwarf planet that does not have an atmosphere. The surface temperature of Pluto averages -229oC (-374oF).
Therefore, the planet with a strong greenhouse effect, whose surface temperature averages 480oC (900oF) is Venus.