The subordinate clause here is A, "as the layers of ash slowly compressed". Subordinate means that it cannot exist on its own, it has to be a part of the main, independent clause.
What is the exact question can you be more clear with it
A play or drama. Could be a musical but it's more likely that your definition is a play/drama.
Answer:
It is important to persevere through challenging situations.
Explanation:
