Question

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Explanation:

The text introduces multiple reasons cats purr (comfort, healing, seeking food/attention) and concludes that purring is a key communication method for cats. Option A only covers a common belief, not the full scope. Options C and D are just single specific reasons, not the main idea. Option B encapsulates all the different purposes of purring as forms of communication.

Answer:

B. "Purring is an important way for cats to communicate" (Paragraph 4)