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补全短文

Most people know that cigarette smoking is harmful to their health.Scientific research shows that it causes many kinds of diseases.In fact，many people who smoke get lung cancel However， Edward Gilson has lung cancer， and he has never smoked cigarettes.He lives with his wife，Evelyn，who has smoked about a pack of cigarettes a day throughout their marriage. ________.

A.The Gilsons have been married for 35 years.

B.The risk is even higher for children who live in homes where both parents smoke.

C.Almost all of US breathe tobacco smoke at times

D.Many public places have nonsmoking areas

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