Which of the following poets wrote the poem "If"?

The poem "If" was indeed written by Rudyard Kipling, making this choice the correct one. Kipling is known for his ability to convey profound moral lessons and life advice through his poetry. In "If," he presents a series of conditional statements that outline the qualities of a mature and resilient character. The poem emphasizes values such as patience, honesty, humility, and perseverance—qualities regarded as essential for personal integrity and growth.

The other poets mentioned in the question are notable for their distinct styles and themes. Henry Wadsworth Longfellow is recognized for his narrative poetry that often draws on American themes and folklore. Edgar Allan Poe is famous for his gothic tales and poems exploring themes of death and psychological depth, such as "The Raven." John Milton is best known for his epic poetry, particularly "Paradise Lost," which delves into profound theological and philosophical questions. Each of their works reflects their unique contributions to literature, but "If" is distinctly associated with Rudyard Kipling's voice and thematic concerns.