Read the following two sentences.The Mississippi River is a major American river. The Ohio River is one of the many smaller tributaries that flow into this gigantic waterway.

A tributary is a smaller river or stream that flows into a larger river. The sentence says the Ohio River flows into the Mississippi River, so “smaller rivers that flow into a larger river” is the correct meaning. Choice C has the right idea, though “flow” would be grammatically correct instead of “flows.”

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