Answer:
The answer is indeed letter D. blank verse.
Explanation:
The poem "Ulysses" by Alfred, Lord Tennyson is written is blank verse. Blank verse consists of un-rhyming lines written in iambic pentameter - a five-time repetition of an unstressed syllable followed by a stressed one. Study the line below, taken from the excerpt in the question:
Old age / hath yet / his hon / our and / his toil;
We may conclude that the letter that best describes the structure of the excerpt is D. blank verse.
Additional information:
Free verse - a poem does not follow any rules for meter or rhyme schemes.
A sonnet - strict rules; 14 lines written with iambic pentameter; specific rhyme scheme.
A ballad - usually divided into quatrains; abab rhyme scheme.