A Crucial Difference That Helps Explain Why Venus Is So

A crucial difference that helps explain why Venus is so hot and the Earth isn't is that:

A) on Venus, there was eventually no ocean to remove carbon dioxide from the atmosphere
B) on Venus, the rocks have enormous amounts of radioactivity, heating up the environment (and also making life impossible)
C) on Venus, the life forms give off more heat than they absorb
D) on Earth, there is additional argon, which exerts a tremendous cooling effect
E) there are no volcanoes on Venus, but many on Earth, producing extra heat