Marking the syllables in a line of poetry is called alliteration scansion consonance assonance

Option B, scansion, is the right answer.

Explanation:

Scansion is a process or method of ascertaining and graphically portraying the metrical exemplar of a line of poetry. In the context of classical poetry, such patterns are based quantitatively on the varying lengths of each syllable. In poetry, they are based on the level of stress placed on each syllable.

answer; ///(gordon allport)