Ozone in the stratosphere blocks deadly ultraviolet rays from the sun, but chlorofluorocarbons (CFCs) in aerosols and other products have thinned this protective layer. Evidence of this is the ozone hole that forms over the South Pole every Antarctic spring as temperatures drop below –78°C, the temperature at which ozone depletion occurs. Measurements of the ozone hole taken at various times this spring show that, compared with the same times the previous year, its area diminished by four million square kilometers. Nevertheless, scientists have not concluded that the ozone layer is recovering.

Which of the following would, if true, provide the strongest reason for the scientists' reaction to the measurements?

A:The ozone hole has steadily grown in size every year for the past decade except this year.

B:The length of time that the ozone hole persists fluctuates from year to year.

C:As a result of international treaties, CFCs have been completely banned for several years.

D:Weather patterns allowed unusual amounts of warm air to mix into the polar regions this year.

E:Human-made CFCs retain their ability to destroy ozone molecules for seventy-five to one hundred years.