Question ID:PT32 S4 Q5 Passage:Cigarette companies claim that manufacturing both low- and high-nicotine cigarettes allows smokers to choose how much nicotine they want. However, a recent study has shown that the levels of nicotine found in the blood of smokers who smoke one pack of cigarettes per day are identical at the end of a day's worth of smoking, whatever the level of nicotine in the cigarettes they smoke. Stem:Which one of the following, if true, most helps to explain the finding of the nicotine study? Correct Answer Choice:AChoice A:Blood cannot absorb more nicotine per day than that found in the smoke from a package of the lowest-nicotine cigarettes available. Choice B:Smokers of the lowest-nicotine cigarettes available generally smoke more cigarettes per day than smokers of high-nicotine cigarettes. Choice C:Most nicotine is absorbed into the blood of a smoker even if it is delivered in smaller quantities. Choice D:The level of tar in cigarettes is higher in low-nicotine cigarettes than it is in some high-nicotine cigarettes. Choice E:When taking in nicotine by smoking cigarettes is discontinued, the level of nicotine in the blood decreases steadily.