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

"The reins of office".

Metaphor

The figure of speech used in the expression "The reins of office" is metaphor.

A metaphor is a figure of speech in which one thing is compared to another thing without using the words "like" or "as." In this case, the reins of a horse are being compared to the power and authority of office. This creates a sense of the power and control that comes with being in office.

The other answer choices are incorrect. Simile is a comparison between two things using the words "like" or "as." Oxymoron is a figure of speech in which two contradictory terms are used together. Alliteration is the repetition of consonant sounds at the beginning of words. None of these devices are used in the expression "The reins of office.".