Answer:
d: Preposition.
Step-by-step explanation:
A preposition is a word that is used as a linking word for joining nouns, pronouns, or phrases with the other words in a sentence. They also tell the position or time something happens, most often being used just before a noun or an object.
In the given sentence, the word during is used just before "the movie" which is a noun and the object of the sentence. Therefore, the word "during" acts as a preposition in the sentence.
Thus, the correct answer is option d.