Which Statement Best Describes the Relationship Between Ozone in the Stratosphere

Which statement best describes the relationship between ozone in the stratosphere and the presence of CFCs?

A) Ozone in the stratosphere is broken down by chemicals like CFCs,but as CFCs themselves are broken apart by UV radiation,ozone depletion slows.
B) When CFCs come in contact with ozone in the troposphere,their reaction sometimes causes increased UV radiation to reach Earth's surface.
C) Ozone naturally breaks down in the stratosphere,but substances like CFCs regulate its reformation so that less harmful UV radiation reaches Earth's surface.
D) Ozone from the stratosphere migrates down to the troposphere,where it reacts with chemicals like CFCs to produce more oxygen.
E) Ozone is formed naturally and is broken down in the stratosphere.However,CFCs cause additional ozone breakdown.