A patron approaches the reference desk and states, "I need to find books about the environment." The librarian responds, "That's a great topic. To help me find the best resources, can you tell me a bit more about what aspect of the environment you're interested in?" What key technique of the reference interview is the librarian using?
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A
Paraphrasing the user's query for confirmation.
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B
Using a closed-ended question to get a 'yes' or 'no' answer.
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C
Providing an immediate answer with a known reference source.
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D
Using an open-ended question to clarify and narrow the information need.