Which of the following methods are effective in controlling photochemical smog? a. Use of cataly...

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Which of the following methods are effective in controlling photochemical smog?
a. Use of catalytic converters in automobiles
b. Controlling primary precursors so that generation of secondary precursors is reduced
c. Planting trees like Pinus, Vitis, Quercus, etc.
(A) \( \mathrm{a}, \mathrm{b} \) and \( \mathrm{c} \)
(B) only a and b
(C) only \( \mathrm{b} \) and \( \mathrm{c} \)
(D) only a
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