B. depth
Having depth means the opposite of being superficial. To get a measure of depth, one must measure in a downward manner. (for the ex: to measure the depth of the Caribbean Sea, we need to measure from the surface to the floor. That would be our depth measure).
Complex sentence. It has one independent clause and one dependent clause.
Answer:
I am confusion on what this means
Answer:
It looks like a simile is used, "dry as a biscuit,". It's comparing how dry something is to how dry a biscuit is.
I'm not sure about the rest, because I don't have context clues, but it looks like that's the only figurative language.