A TOEFL Reading passage on linguistics discusses "code-switching"—the practice of alternating between two languages or dialects in a single conversation. The author notes this is most common in bilingual communities. What inference can be drawn from this observation?
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A
Code-switching indicates a deficiency in one of the speaker's languages.
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B
Code-switching reflects the speaker's linguistic flexibility and the social contexts in which they operate.
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C
Code-switching occurs only in formal academic settings.
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D
Bilingual speakers always prefer to speak in one language at a time.