The first thing to do to improve the situation is to distribute an agenda ahead of the meeting so people know what to expect.
An agenda is basically a structured list of topics that needs to be discussed during the meeting.
Therefore, the Option B is correct because the first thing to do to improve the situation is to distribute an agenda ahead of the meeting so people know what to expect.
Missing options includes "A. distribute minutes after the previous meeting to remind people of what was covered B. distribute an agenda ahead of the meeting so people know what to expect C. distribute homework assignments several days before each meeting D. criticize people during the meeting if they are not contributing enough E. criticize people after the meeting to make his point without embarrassing them"
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