Answer:
one who ... / a person who ... / someone who ....
Explanation:
performer = a person who performs
teacher = a person who teaches
painter = a person who paints
singer ....
dancer ....
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.
The only error I can see in this sentence is roll-a-coaster. I believe it should be a roller coaster instead, which is a ride in amusement parks. Other than that, it is more grammatically correct to say "I've just gotten off the wooden" rather than "I just got off the wooden" however, it's up to you.
D) him, Sean, and me went to the new movie.
Hope this helps :)