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Correct answer: B
Explanation
B is correct because the passage synthesizes opposing views (democratization vs. polarization) to conclude it is a powerful amplifier, reflecting complexity. A is incorrect because the author does not state that harm is absolute, only that bias exacerbates issues. C is incorrect because the passage notes bypassing gatekeepers but does not claim this replacement is complete. D is incorrect because the author explicitly balances the potential benefits against the risks of discord.