Why Is the Hole in the Ozone Greatest Over Antarctica

Why is the hole in the ozone greatest over Antarctica?

A) The ozone hole is a natural phenomenon related to high polar stratospheric clouds.
B) South American countries have not ratified the Montreal Protocol and continue to release ozone-destroying CFCs.
C) Chlorine freed from CFCs elsewhere migrate to the Antarctic region,where they are trapped by the polar vortex.
D) Ozone,a greenhouse gas which traps ultraviolet energy radiated from Earth's surface,has highest concentration in Antarctica.

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