The section that is indicative of the conclusion that chocolate milk was initially accepted is the third paragraph which states that the students protested about the unavailability of an alternative to regular milk and got chocolate milk.
A conclusion is the latter end of a text. It, in most cases, contains either the resolution of a story, in the case of a novel or fiction or the summary of key points in the case of an expository text.
Hence the section of the story that supports the conclusion that students accepted the chocolate milk ban and when it first started is found in the third paragraph of:
"Bay Area School's chocolate milk protest gives students firsthand lessons in persuasion."
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