Answer is C- A sentence that has words with the same letter, but in close proximity.
Ex: (R)yan (r)apidly (r)ushed (r)ound the co(r)ne(r) as he (r)an the (r)ace.
Dont get confused with B- A sentence that STARTS with words that have the same letters throughout the sentence.
Ex: (W)e all (w)ished (w)e could dance together under the (w)aterfall.
D- Words that are a sound. Ex: POW, BANG, WHOOSH.