Answer and explanation

Correct answer: A. stroke

  1. Step 1: 'A stroke of luck' is the fixed phrase for a lucky event.
Answer
stroke.
Why not the others: "slice" is wrong because 'a slice' is a portion of food. "blow" is wrong because 'a blow' is a misfortune, not a piece of luck. "beat" is wrong because 'a beat' is a rhythm or a regular route.

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