What is the main reason to do research before a group discussion

To set the discussion topic

Explanation:

Hi, Group discussion is a means of collecting data in one go from several people (who usually share common experiences) and which concentrates on their shared meanings.

They include setting, or helping the group to set the discussion topic; fostering the open process; involving all participants; asking questions or offering ideas to advance the discussion; summarizing or clarifying important points, arguments, and ideas; and wrapping up the session.

For all of this, you need information and do research.

silk

indigo  

rice

all the other answers are wrong