Please answer the following question by reasoning step-by-step.
One of the following sentences is nonsensical. Which one is it?\nOptions:\n- Sentence A: "He rode a horse on the prairie"\n- Sentence B: "He rode turtles on the prairie"\n

Sentence B
Turtles are too small and slow to be good for riding, and they live near rivers or bodies of water.

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The final answer: Sentence B