Question ID:PT30 S4 Q4 Passage:A certain gene can be stimulated by chemicals in cigarette smoke, causing lung cells to metabolize the chemicals in a way that makes the cells cancerous. Yet smokers in whom this gene is not stimulated have as high a risk of developing lung cancer from smoking as other smokers do. Stem:If the statements above are true, it can be concluded on the basis of them that Correct Answer Choice:AChoice A:stimulation of the gene by chemicals in cigarette smoke is not the only factor affecting the risk for smokers of developing lung cancer Choice B:nonsmokers have as high a risk of developing lung cancer as do smokers in whom the gene has not been stimulated Choice C:smokers in whom the gene has been stimulated are more likely to develop lung cancer than are other smokers Choice D:the gene is more likely to be stimulated by chemicals in cigarette smoke than by other chemicals Choice E:smokers are less likely to develop lung cancer if they do not have the gene