Question

Miss Marple is an intimidating figure, who uses a patronizing tone to achieve a sense of authority.
Or
Miss Marple is an approachable figure, who uses her sharp observation skills to solve mysteries.
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Answer 1

Miss Marple is an intimidating figure, who uses a patronizing tone to achieve a sense of authority.

Or

Miss Marple is an approachable figure, who uses her sharp observation skills to solve mysteries.

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Explanation:

Miss Marple is a  fictional character in Agatha Christie's novel.Miss Marple is a white-haired old lady with a gentle, appealing manner.She has spent her life in the small village of St Mary Mead.She is egregiously worldly. She is a keen observer of human nature.

Miss Marple is very effective as a detective due to her ability to blend into the background,  shrewd intelligence all this is  hidden behind her love of knitting, gardening and gossip; unassuming and often overlooked, she has the opportunity to pursue the truth .

She is not only knitting a cardigan but also solving a crime in her unassuming demeanor .