Correct option is A
Option (a) "To be old-fashioned" is the correct meaning of the idiom "Behind the times." This phrase is used to describe someone or something that is outdated or not keeping up with current trends or standards.
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"Behind the times" – This phrase typically refers to being out of touch with modern developments or trends, often used negatively to criticize a lack of progress or modernity.
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Example: Despite the advances in technology, he prefers to stay
behind the times, using his old typewriter.