Acquisition of a second language requires meaningful interaction - natural communication - in which speakers are concerned not with the form of their utterances but with the messages they are conveying and understanding.

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The main idea tested is that language learning happens best through meaningful, real communication where the focus is on understanding and conveying messages rather than on perfect grammar forms. This view is associated with Stephen Krashen, whose theory emphasizes that acquiring a language comes from engaging in natural, communicative use in which learners pay attention to meaning, not to linguistic form. The statement mirrors Krashen’s belief that genuine interaction in the target language facilitates acquisition more than form-focused drills. The other options don’t relate to this theory: a term for a conjunction used to connect clauses, a poetic device about rhyme, and a grammatical perspective about person, respectively.