Mitra found it better because students or people learn better in groups rather than being single.
Explanation:
Group learning is always better than learning rather than learning single. People in group can discuss on a certain topic which they learn. The discussion learning is helpful in solving greater ability to view situations from others' perspectives.
Students can discuss their doubts without any fear. But when it comes to media, the role of the media is spreading information on a large scale. Media is a one such platform which provides information more people at a same time. People who are in group can discuss the news or information in details and clear their views on that piece of information.
Yes, because it's a picture taken of the event.
You know a secondary source is something that DID NOT take part of or witness the event, so a Primary source is something that DID take part of, or witness the event.
So a picture would be a Primary source.