Why Was a Comet Impact 65 Million Years Ago a Chance

Why was a comet impact 65 million years ago a chance happening that benefited the evolution of humans?

A) It deposited a significant amount of nitrogen into the Earth's atmosphere.
B) It led to an increase in global UV radiation, which killed off most of the forests and jungles.
C) Mammals got an evolutionary boost.
D) Plant life began to decline.
E) It brought human DNA to Earth.

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