The correct answer is D. A set of unstressed and stressed syllables
Explanation:
In poetry, the word "iamb" refers to a type of metrical feet (a unit that composes verses) consisting on the combination of an unstressed syllable or short syllable and a stressed, long or accented one that creates a repetitive rhythm in verses and therfore in poems. Indeed, the "iamb" is one of the most common metrical foot used in English poetry, especially through "iambic pentameter" in which a verse is composed of five iambs, although, there are different combinations of iambs that can be used including iambic dimeter (two syllables) or the iambic tetrameter (four iambs). Considering this, it can be concluded the iamb is basically "a set of unstressed and stressed syllables" that compose verses and provide rhythm to poems.
