Part A: The best answer is D. Each line has 10 syllables and follows a pattern of an unstressed syllable followed by a stressed syllable. This describes iambic meter, which is common in English poetry.
Part B: The best answer is A. It gives the poem a melodious quality to sing the praises of Frederick Douglass. The iambic meter contributes to a flowing and lyrical quality, often used in poetry to evoke admiration or tribute.