An unexpected stroke of good luck
A. Fortune
B. Windfall
C. Boon
D. Breakthrough
Answer: Option B
Solution (By Examveda Team)
One word substitute is Windfall.Fortune: chance or luck as an arbitrary force affecting human affairs.
Windfall: a large amount of money that is won or received unexpectedly.
Boon: a thing that is helpful or beneficial.
Breakthrough: a sudden, dramatic, and important discovery or development.

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