Why Is the Hole in the Ozone Greatest Over Antarctica

Multiple Choice

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 the Earth's surface, has highest concentration in Antarctica.