Step 1: Concept The preposition "for" is used to specify a duration or a period of time.
Step 2: Meaning The sentence indicates the total length of time she spent dancing.
Step 3: Analysis Since "one hour" is a period of time, "for" is the correct preposition to show how long the action lasted.
Step 4: Conclusion The correct phrase is "for one hour".
Final Answer: (C)
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Top AP ECET BSc Mathematics Analytical Ability Questions