"The Varied Effects of Reduced Ozone"
This passage discusses more than one effect (tornadoes) of reduced ozone and only briefly mentions CFCs. It does not, however, give great details about any other components of the Earth's atmosphere or their effects on human life.
B "The Earth's Atmosphere and Human Life"
C "The Harmful Nature of CFCs"
D "The Ozone Layer Prevents Tornadoes"