Type the subordinate clause in this sentence.

edgar allan poe was an american author who wrote gothic and macabre short stories.

Subordinate clauses are those that cannot exist on their own, when they are not part of the independent clause. They always sound and look incomplete, because they are - they need to be included into an independent clause in order to be grammatically correct.
Having this in mind, the subordinate clause here is who wrote Gothic and macabre short stories.

B. metaphor is the answer