The literary device used in the given lines is, repetition.
What is literary device?
Literary device is a technique use by writer to add effect to the text.
Because, the repetition refers to when the words in a poem is using same words multiple times, and this a literary device. The purpose of using repetition of words is to increase the passion and rhythm in the poem. And such literary device helps make poem to form a motion and adds rhythm. So in the given lines the word O night and alack is used multiple times, meaning the literary device used is repetition.
Hence the correct option is, C) Repetition
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