What is the biggest difference between Earth's modern atmosphere and the atmosphere of Venus?

A.
Earth's atmosphere is primarily nitrogen and oxygen; Venus's atmosphere is primarily carbon dioxide and nitrogen.
B.
Earth's atmosphere is primarily nitrogen and oxygen; Venus's atmosphere is primarily carbon dioxide and methane.
C.
Earth's atmosphere is primarily oxygen and carbon dioxide; Venus's atmosphere is primarily carbon dioxide and nitrogen.
D.
Earth's atmosphere is primarily oxygen and carbon dioxide; Venus's atmosphere is primarily carbon dioxide and methane.

Aquarterback pedals 3.3meters southward and then run 5.7meters northward. whats the distance ? and whats the displacement?

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Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?