D
Explanation: D) Effective meeting leaders keep the discussion on track, follow agreed-upon rules, encourage participation, participate actively, and close effectively. In meetings, it is natural for some people to be more involved and for some people to dominate the discourse. However, when extremes of these trends occur, the person running the meeting must take action. A participant may be fairly quiet during the meeting, for example, but it is not acceptable for that person to be completely disengaged. Similarly, a dominant participant who lets no one else get a word in edgewise must be managed, or the meeting will produce no meaningful results.