Which fact would best help Trent understand this poem’s meaning? Sod is another name for grass, and it often looks silvery-white in the winter.
People often wear black shoes and warm gloves in the winter.
Many animals migrate to warmer climates during the winter.
During the winter, the clouds are very thick and look silver in the sky.

Sod is another name for grass, and it often looks silvery-white in the winter.

Explanation:

Robert Louis Stevenson's poem "Winter-Time" talks about the cold snowing winter. Moreover, the poem described the winter scene as from one's childhood, from a child's perspective.

When Trent reads the poem, he would most probably have a problem understanding what the speaker means by the word "sod". "Sod" is a word generally used to mean grass, or a meadow, pasture, lawn, grassland, etc. So, if he knows that sod is another name for grass and that it usually appears silvery-white in winter, with the snow covering it, he will better understand the poem's meaning.

Thus, the correct answer is the first option.