Answer:
So the first one, you would be right. It's a triangular base.
The second one, you should say quadrants.
Hope this is helpful!
D. That all aspects of the piece should work together to create a certain effect
To create a "unity of effect" on the reader, it should have a certain effect on the reader. Like a really sad and depressing book should not exactly make the reader sad, but to feel the parts of the book that spoke out to the reader.
The answer is D
extra wording XD