Answer:
The sentence that contains a subordinating conjunction is Although Stacey wanted to leave the party, she waited until Jeanette was ready.
Explanation:
Subordinating conjunctions join together dependent and independent clauses, they can also introduce adverb clauses. in the sentence " Although Stacey wanted to leave the party, she waited until Jeanette was ready" the extra information is dependent and it is using one of the common subordinating conjunctions fro contrast that is "Although".
