What makes a question or comment relevant to a discussion?

A. It explores an idea.

B. It follows the rules set by the group.

C. It responds to a question.

D. It is clearly connected to the topic.

A. It explores an idea.

All of the options mentioned contribute to making a question or comment relevant to a discussion. Option C, "It responds to a question," is relevant when there is a specific question posed that the comment or question directly addresses. Option A, "It explores an idea," indicates that the question or comment adds depth or extends the conversation by examining a concept or perspective. Option B, "It follows the rules set by the group," suggests that the question or comment adheres to any guidelines or guidelines established by the discussion group or forum. Finally, option D, "It is clearly connected to the topic," means that the question or comment is directly related to the subject or theme under discussion.