Why Is the Hole in the Ozone Greatest Over Antarctica

Multiple Choice

Why is the hole in the ozone greatest over Antarctica?

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