I say C is the correct answer.
Answer:
C. The length of the presentation and D. The authority of the quoted experts
Explanation:
The answer for your question is actually D because when talking about context its best you have quoted experts but in general I would say both.
For your question though so you don't get confused on which answers it is its
C is the answer.
If you have more than 1 listing by the same author, alphabetize the works by the first major word in the title. But don't write the author's name again, use three hyphens followed by a period.
