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

"All the world is a stage"

Metaphor

The figure of speech (poetic device) used in the expression "All the world is a stage" is Metaphor. (Option 4)

Explanation:

Metaphor is a figure of speech that involves making a direct comparison between two unrelated things to highlight their similarities. In this case, the speaker is metaphorically comparing the world to a stage, suggesting that life is like a play or drama.

The other options are defined as follows:

Personification involves giving human-like qualities to non-human entities or objects.

Simile involves comparing two unlike things using the words "like" or "as."

Alliteration is the repetition of consonant sounds at the beginning of closely positioned words.