How does the poet in the ninth-century Irish poem convey the changes in nature?

The correct answer highlights the poet's use of detailed imagery and sensory descriptions to convey the changes in nature. This technique is fundamental in poetry, as it allows readers to visualize the transformation of the environment through vivid and engaging language. For example, the poet might describe the colors of autumn leaves, the sounds of winter winds, or the blooming of spring flowers, providing a rich sensory experience that helps to reflect seasonal changes.

By employing imagery, the poet not only paints a picture of nature’s progression but also evokes the emotions and atmospheres associated with different times of the year, deepening the reader's connection to the natural world. This approach fosters an appreciation for the beauty and complexity of the changing seasons, illustrating how nature is dynamic and ever-evolving.

The other choices, while they may also be present in the poem, do not encapsulate the primary method used by the poet to convey changes in nature as effectively as the use of imagery and sensory details. Contrasting seasons can be part of this imagery but is just one aspect of a broader descriptive strategy. Focusing on human emotions or allegories may provide depth but does not primarily serve to illustrate the changes in nature itself.