The Thinning of the Ozone Layer Over the Antarctic Always

The thinning of the ozone layer over the Antarctic always occurs at the end of the Antarctic winter because

A) UV from the sun is necessary to the creation of ozone from oxygen and the Antarctic receives no UV from the sun during its winter.
B) During their winter, residents of the southern hemisphere use more CFCs.
C) Ozone is consumed by melting ice as winter transitions to summer.
D) The Antarctic experiences its highest level of radiation during its winter.