Answer:
They hadn't seen the movie, yet they knew every song.
Step-by-step explanation:
Conjunctions are those joining words that joins groups of words or sentences, making them into one sentence. They are used as a shortening agents for multiple sentences. Among the options given in the question, the sentence that contains a conjunction is the third sentence.
They hadn't seen the movie, yet they knew every song.
Here, 'yet' is the conjunction that joins the two parts of the sentence, making it into one. By joining the two clauses, it makes it easier and more compact to read the sentence.