Young people spend most of their time , for they don’t want to stay at home all day.A. out

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A. outdoor
(答案→)B. outdoors
C. indoor
D. indoors
解析：考查词性辨析。Outdoor和indoor都是形容词，可以做定语；outdoors和indoors都是副词在句中通常做状语。本句中的outdoors做状语，修饰谓语部分spend most of their time。句意：年轻人把很多的时间都花在了户外，因为他们不想整体都待在家里。故B正确。