Option B nodded off is the appropriate choice to fill in the space provided
A phrasal verb is often a single semantic unit in the traditional grammar of Modern English that consists of a verb collocated with a particle, a particle, a preposition, or an adverbial prepositional phrase.
Phrasal verbs are two or more words that together act as a completely new word, with a meaning separate from the original words.
Therefore, the appropriate response is B nod off, which refers to starting to sleep, especially unintentionally.
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