ACCorDing to thE pAssAgE, lung CAnCEr ______.
A．is thE mAjor CAusE oF DEAth BEtwEEn thE AgEs oF 35 AnD 55
B．is most oFtEn CAusED By smoking
C．nEvEr AFFECts non—smokErs
D．hAs nothing to Do with smoking