Answer and explanation

Correct answer: D. by

  1. Step 1: 'By' marks a deadline: not later than Friday.
Answer
by.
Why not the others: "until" is wrong because 'until' is used for continuing states, not deadlines. "during" is wrong because 'during' is used for a period within which something happens. "since" is wrong because 'since' cannot refer to a future point.

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