Correct Response: B. Option B is correct because the phrase one fell swoop is an idiom. An idiomatic expression is a word or set phrase that derives its meaning from common usage and not from the combined literal meanings of component words. After explaining the meaning of an unfamiliar idiom, a teacher can most effectively deepen a student's understanding of the idiom by providing several additional examples of the idiom used in comprehensible contexts. Options A and C are incorrect because one fell swoop functions semantically as a single unit, so strategies for determining the meaning of its component words would not help the student determine the meaning of the idiom as a whole. Tree diagrams (D) are used to represent the grammatical structure of a sentence. This would be useful in helping the student determine the grammatical function of the phrase in the sentence but not its meaning.
