The evidence that would be best to add to support the argument is, "The paper gives students..., whereas social media site is already pre-formatted."
What is evidence?
Evidence is a piece of information we provide in a text with the purpose of supporting an argument. Here, we need to choose evidence that will support the argument that the paper is still needed.
The best option in this case is letter D. The author mentions social media and how the paper will be canceled. Thus, evidence that mentions both the paper and social media and which compares the two of them is the best option.
We can already eliminate options B and C. Now, option A argues that everyone already knows how to post on social media sites. Since that is not necessarily true, we can also eliminate this option.
In conclusion, option D as the best answer. It explains that there is a lot to learn from working in a newspaper when it comes to design, compared to social media.
Learn more about evidence here:
https://brainly.com/question/1256677