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The line that is a direct quotation from an external source is "the historian Celina Fox explains that tea-time had become a smart event."
What is a direct quotation?
The direct quotation implies using exact words from the source or author's writings. The quotation is used at starting and end in order to show that is original writing to give appropriate meaning to the sentence.
Therefore, whenever a person uses external data the name and source should be mentioned to give credit to the original writer.
Learn more about quotations here:
https://brainly.com/question/16910204