[单项选择]C Few laws are so effective that you can see results just days after they take effect.But in the nine days since the federal cigarette tax more than doubled—to $1.01 per pack——smokers have jammed telephone“quit lines”across the country seeking to kick the habit. This is not a surprise to public health advocates.Theyve studied the effect of state tax increases for years，finding that smokers，especially teens，are price sensitive.Nor is it a shock to the industry, which fiercely fights every tax increase. The only wonder is that so many states insist on closing their ears to the message.Tobacco taxes improve public health，they raise money and most particularly,the deter people from taking up the habit as teens，which is when nearly all smokers are addicted.Yet the rate of taxation varies widely. In Manhattan，for instance，which has the highest tax in the nation，a pack of Marlboro Light Kings cost $10.06 at one drugstore.In Charleston，S.C., where the 7centapack tax
A. the price of cigarettes
B. the rate of teen smoking
C. the effect of tobacco tax increase
D. the differences in tobacco tax rate

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