Match List I with List II and select the correct answer using the code given below the Lists :

List I (Air Pollutant)	List II (Effect)
A. Chlorofluorocarbon	2. Depletion in ozone layer in atmosphere
B. Sulphur dioxide	1. Acid rain
C. Lead compound	3. Harmful for human nervous system
D. Carbon dioxide	4. Topmost contribution to greenhouse effect

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Electoral disputes arising out of Presidential and Vice-Presidential Elections are settled by :