Select the correct answer. Why was Al Pacino's character's speech in Any Given Sunday successful?

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a)   it explains that many people died because medicines and medical practices were not effective.

many is the pronoun that is used in this sentence. many is a quantifier that determines the amount of discoveries. when we use quatifiers followed by nouns, they act as determiners, but when they are used without a noun, as it is this case, they are pronouns.