I still consider B as the right answer, lets take the amount of Nicotine level in the cigarette was orginally 500 gms instead of 800 gms( legally accepted level), thereby the people had been smoking atleast 2 cigarettes to reach the required nicotine level. Since the question premises states that the Govenment would reduce the level of nicotine, so obviously people would smoke more than two cigarettes to maintain the required Nicotine level, so the effect would not change. option E looks irrelevant
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