The function or purpose that an analogy plays in an informational text would be:
D). To explain a concept through comparison.
- 'Analogy' is described as a rhetorical device in which the author establishes an association of equivalence or similarity between a familiar and an alien concept.
- The purpose behind this is to elaborate the unfamiliar concept to the audience easily and effectively by comparing it to the familiar one.
- This helps the reader relate to the concept and understand it conveniently.
- Thus, option D is the correct answer as it correctly states that analogy is employed to elaborate an idea or concept via comparing it to a known one.
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