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a
Hole in ozone layer
b
Reduction in thickness of ozone layer in troposphere
c
Reduction in thickness of ozone layer in stratosphere
d
Increase in concentration of ozone
answer is C.
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Detailed Solution
The ozone hole is the place where the thickness of the ozone layer is very thin and the concentration is less than 220 DU. It is seen over Antarctica due to the process of polar vortex and formation of polar stratospheric clouds.Hence, the correct answer is 'Reduction in thickness of the ozone layer in stratosphere'.