Answer:
I believe the answer is D
Explanation:
Who just finished the marathon is tired is the subordinate clause, because it started with a relative pronoun, it is classified as a relative clause. "Just" is the subordinate conjunction and it is an adverb because it modifies the "finished" in the sentence to show immediacy.
When they flaunt their popularity, I feel like they're trying to get me to consume because "everyone else is doing it."
This is also known as joining the bandwagon, so I'll have to go with:
Bandwagon
Let me know if this helped, as I don't have 100% proof.