The term old-fashioned describes the overall tone of the passage.
<h3>What tone of a passage?</h3>
An expression of the attitude made by the writer or the author in a literary composition, which conveys feelings or environment, is known as tone of a passage.
Hence, option D holds true regarding tone of the passage.
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The answer is ''the overall topic of the author's essay''
encouraging readers in the end to look at their world in a more quantitative way
