[单选题]
______
A .Recently, though, scientists changed their opinion after they studied a large group of nonsmokers.
B .The Gilsons have been married for 35 years.
C .This smoke is called secondhand smoke.
D .However, secondhand smoke is dangerous to all people, old or young.
E .As a result, they have passed laws which prohibit people from smoking in many public places.
F .In the United States, nine million children under the age of five live in homes with at least one smoker.
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