In textual composition (Ekthesi), what is the primary structural purpose of the topic sentence in a paragraph?

Answer and explanation

Correct answer: B. Formulating the central controlling idea of the unit

  1. Step 1: A well-structured expository paragraph in Greek rhetorical practice opens with a clear topic sentence (thematiki periodos). This sentence establishes the paragraph's controlling thesis, which subsequent development sentences elaborate and substantiate. Answer: Formulating the central controlling idea of the unit. Why not the others: "Providing supporting empirical data" belongs to the development section (leptomereies/scholia) of the paragraph; "Offering transitional reflections" serves as a cohesive bridge between distinct thematic paragraphs; "Summarizing secondary viewpoints" is characteristic of counter-argument rebuttals or concluding sentences.

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