Her extraordinary stage performance should not be attributed to sheer fluke only.

event
accidence
chance
meeting

The correct answer is C. chance.

A fluke is an unlikely and improbable event, so it is not the correct answer. An event is something that happens, so it is not the correct answer. An accident is an unfortunate event that happens unexpectedly, so it is not the correct answer. A meeting is an occasion when two or more people come together, so it is not the correct answer.

Chance is the possibility of something happening, especially something that is unlikely. In this case, the speaker is saying that the woman’s extraordinary stage performance was not just due to luck. She must have worked hard and practiced a lot to be so good.