In the sentence provided, the underlined word "remarkable" is an adjective as it describes the noun "ability." Adjectives are words that modify nouns and provide more detail about them. In this case, "remarkable" enhances our understanding of the type of ability being discussed. ;
The underlined word "remarkable" functions as an adjective in the sentence, as it modifies the noun "ability." Therefore, the correct answer is option b) Adjective.
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