The technique that Dickinson uses in the phrase "Much Madness" is A.
alliteration. Alliteration refers to the repetition of the same
consonant at the beginnings of neighboring words - here, the letter M
is repeated. Imagery refers to the use of descriptive language to create
vivid images in the minds of the readers. Rhyme is the repetition of
the same syllable at the end on lines in poetry. Enjambment is when
authors continue a thought from one line into another.
