B, Hasn't
C. Haven't
D. Weren't
The answer choice which is a singular contraction among others is; Choice B; Hasn't.
A contraction as the name implies is a shortened version of the spoken and written forms of a word, syllable, or word group, created by omission of internal letters and sounds.
The singular contraction in this case is Hasn't as it emerges from the words Has and Not and since, has is a singular verb.
Read more on singular contractions;
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diction
rhyme
broadside
Structureor style refers to the pattern or form of a poem. Structure deals with the lines’overall organization as well as its rhyming. A poem could be evaluated throughits number of stanzas or form (lyric, narrative and descriptive).