It should be noted that the central idea in the passage is C. A fight for a particular cause may have unintended consequences, bad or good.
A central idea simply means the main idea that can be found in a literary work. It's the main idea in the passage.
In this case, central idea in the passage is that a fight for a particular cause may have unintended consequences, bad or good.
When people protest against a particular thing, it'll have either a positive or negative impact.
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