To Pre-Empt the Problem of Group Members with Different Agendas

To pre-empt the problem of group members with different agendas, a facilitator should

A) Introduce the facilitator's agenda at the start of the meeting and stick to it.
B) Have no agenda, but just go with the flow.
C) Negotiate an agenda with group members in advance, gaining their commitment to it prior to the start of the meeting.
D) Have the person with the most power at the meeting state the agenda and tell everyone to follow it.
E) Only (a) and (b) .