Here are the responses to whether each change would make the sentence more objective:
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remove the word “supply” - No (Removing "supply" would make the sentence less clear, which does not contribute to objectivity.)
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remove the word “brazen” - Yes (The word "brazen" adds a subjective connotation; removing it would make the sentence more objective.)
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change “concept” to “brilliant idea” - No (The phrase "brilliant idea" is subjective, while "concept" is more neutral.)
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change “we learn” to “readers learn” - Yes (Changing "we learn" to "readers learn" makes it more objective by removing the personal pronoun.)