(i) They form acid rain. |
(ii) They cause breathing problems in humans. |
(iii) They interfere with photosynthesis in plants. |
(iv) They result in the depletion of ozone layer. |
A) (i) only
B) (i) and (ii) only
C) (i), (ii) and (iii) only
D) (i), (ii), (iii) and (iv)
Correct Answer: D
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