What Is the Current Situation with the Ozone Layer

Multiple Choice

What is the current situation with the ozone layer? 

A)  The large annual decrease in ozone over the south pole is caused by spinning vortices containing clouds of ice crystals with absorbed CFCs on their surfaces. 
B)  Up to 20% of the ozone over Antarctica is destroyed each year. 
C)  The ozone hole in the Arctic is most prevalent in January. 
D)  The ozone hole is larger in the northern hemisphere than in the southern hemisphere.