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Detailed Analysis: This question tests the difference between opinion and fact. An opinion expresses personal feelings or judgments, while a fact is information that can be proven true. Option A: The Osage reservation is in Oklahoma—This is a geographical fact that can be verified. Option B: People loved to watch Maria dance—The word "loved" expresses the audience's subjective feeling, making this an opinion. Option C: Maria started a ballet school—This is something she did, a verifiable fact