As used in paragraph 3, the phrase "flashes of poetry" most likely refers to periods of time when the
woman's husband

The phrase expresses the moment when the husband was writing creatively.
You didn't show the text to which this question refers, however, by the context of the presented sentence, we can see that the sentence shows that the husband used to write creatively.
We can reach this conclusion because:
With that, we can consider that the first answer option is the correct answer.
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