Which of the Following Is True Concerning the Benefits of Quitting

Which of the following is true concerning the benefits of quitting smoking?

A) The risk of dying of lung cancer is double among smokers than in those who have never smoked.
B) Persons who quit smoking before the age of 50 have half of the risk of dying in the next 15 years compared with those who continue to smoke.
C) The risk of dying of coronary heart disease for smokers is double that for lifetime nonsmokers, as is the risk of dying from a stroke.
D) a and b
E) b and c