Final answer:
The phrase 'Trod with a lighter tread' uses alliteration due to the repetition of the 't' sound at the beginning of 'Trod' and 'tread'. The Correct multiple-choice option is (A) alliteration.
Step-by-step explanation:
The sound device being used in the phrase "Trod with a lighter tread" is alliteration. This is because alliteration is characterized by the repetition of initial consonant sounds in a series of words.
In this phrase, the repetition of the 't' sound in "Trod" and "tread" is a clear example of alliteration. Alliteration is used in poetry to create rhythm, enhance mood, or emphasize certain words or themes.
The Correct multiple-choice option is (A) alliteration.