Alphabetically, by authors' last names
Answer:
I believe your answer is D. Sorry if I'm wrong.
Most commonly "C", because they would want the reader to understand that something is different. Yes, they can change the style whenever they want to, but it would be more meaningful if they did it for a reason.
I don't have doctor friends
This is correct. Make sure to put a space after the comma that comes after Daises though.