Discussion
Depletion of Ozone layer is responsible for
Answer: A
The keyed answer is Global warming.
Of the four options, global warming is the only one with any link to the ozone layer. The chemicals that destroy ozone, such as CFCs and halons, are also powerful greenhouse gases, and the loss of ozone is bound up with changes in the climate. That is why a question that asks what ozone depletion is responsible for is keyed to global warming.
The more direct effect of a thinner ozone layer is more ultraviolet radiation reaching the ground, which causes skin cancer and cataract and harms crops and plankton, so the keyed link is the indirect one. De-forestation, landslides and earthquakes have nothing to do with the ozone layer, so the other three options are wrong.
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