From the given options, select the Figure of Speech (Poetic Device) used in the expression:

The lightning, danced across the sky

Personification

The figure of speech used in the expression "The lightning danced across the sky" is personification.

Personification is a figure of speech in which inanimate objects are given human qualities. In this case, the lightning is being given the human quality of dancing. This creates a sense of the lightning as being a powerful and graceful force of nature.

The other answer choices are incorrect. Oxymoron is a figure of speech in which two contradictory terms are used together. Pun is a play on words. Simile is a figure of speech in which two things are compared using the words "like" or "as." None of these devices are used in the expression "The lightning danced across the sky.".

The personification "The lightning danced across the sky" is a beautiful image that captures the power and grace of lightning. It is often used to describe the feeling of awe and wonder that we experience when we see lightning strike.