Preposition are described as the words that function to connect/link a noun or pronoun to the other words in the sentence and displays the relationship between them.
In the given sentence, the word 'during' functions as a preposition as it links the noun 'the movie' to the previous words employed in the sentence and reflects the relation between them. This demonstrates the association between the noun and other elements of the sentence(primary function of a preposition). Thus, <u>option B i.e. 'preposition'</u> is the correct answer.