Which poem by Horace deals with the themes of poetry and art?

The correct answer is "Ars Poetica," which is a poem by Horace that explicitly engages with the themes of poetry and art. In "Ars Poetica," Horace outlines his views on the nature of poetry and what constitutes good poetic practice. He discusses the purpose of poetry, the relationship between the poet and their audience, and the moral and aesthetic values that should guide artistic creation. This poem serves as a foundational text in the realm of literary theory, influencing countless writers and thinkers about the art of poetry.

The other options do not focus on these themes. "Marriage a la Mode" is a work by John Dryden that satirizes the marriage institution but does not delve into the art of poetry itself. "Annus Mirabilis" is a poem by John Milton reflecting on events of the year 1666 but does not specifically address the nature of poetry. "The Monkey's Raincoat" is a short story by J.A. Jance and does not relate to poetry or art, making "Ars Poetica" the only choice that directly concerns the themes in question.