Correct option is B
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Highlighted Word: river
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Word Class: Noun
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Explanation: The word "river" is a noun that refers to a natural watercourse.
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Meanings of other options:
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Pronoun: A word that takes the place of a noun (e.g., she, this).
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Noun: A word that represents a person, place, thing, or idea (e.g., table, happiness).
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Adjective: A word that describes a noun (e.g., cold, bright).