A student reads a paragraph about dolphins. The first sentence says, 'Dolphins are highly intelligent marine mammals.' The rest of the paragraph gives examples of dolphins solving puzzles, using tools, and communicating. What role does the first sentence play?
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A
It is an unimportant introductory comment
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B
It states the main idea of the paragraph
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C
It provides a supporting detail about dolphins
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D
It introduces a contrasting idea