Margaret Drabble? George Plimpton? Apocryphal?

Question for Quote Investigator: When novelists are asked to explain the meanings of the stories they create some are happy to comply. However, many are reticent to present a single definitive interpretation to a complex multilayered narrative. The English novelist Margaret Drabble provided a humorously caustic reply. Would you please help me to find a citation for her comment about the meaning of her tales?
Reply from Quote Investigator: In 1978 “The Paris Review” published an interview with Margaret Drabble. She was asked about the letters she had received from members of the public. Boldface added to excerpts by QI:1
What really annoys me are the ones who write to say, I am doing your book for my final examinations and could you please tell me what the meaning of it is. I find it just so staggering—that you’re supposed to explain the meaning of your book to some total stranger! If I knew what the meanings of my books were, I wouldn’t have bothered to write them.
Below are additional selected citations in chronological order.
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