The correct answer is C. A pattern of accented and unaccented syllables
Explanation:
"Metrical foot" is a term mainly used in poetry to describe the structure of verses mainly based on the number of syllables and whether these are long syllables (accented syllables) or short syllables (unaccented syllables). In this way, the combination of patterns unaccented and accented syllables lead to different metrical feet that give poems different types of rhythms. In the case of the English poetry, for example, one of the most common patterns is the Iambic pentameter in which verses are composed by five iambs and each iamb is a combination of an unaccented syllable and one accented syllable. Therefore, a metical foot is "a pattern of accented and unaccented syllables".
