Which of the Following Is True

Which of the following is true?

A) People of African descent retain more nicotine per cigarette than do Caucasian smokers, and therefore smoke fewer cigarettes per day.
B) People of African descent retain less nicotine per cigarette than Caucasian smokers, and therefore smoke fewer cigarettes per day.
C) Caucasians retain more nicotine per cigarette than people of African descent, and therefore smoke fewer cigarettes per day.
D) Asians retain more nicotine per cigarette than Caucasian smokers, and therefore smoke more cigarettes per day.