What sentence demonstrates the most appropriate tone when writing to an adult?
due to the busy schedules of all members, the committee meeting will be brief. prepare an hour for a brainstorm session.

everyone is very busy, so we have tried to plan for the best use of our time at this week's committee meeting. we would like all members to attend if possible.

the committee has thought about schedules, the best time to meet, how long the meeting should last, and we promise not to take up too much time during the meeting.

there are several members not coming to the committee meeting. everyone who does come is expected to be prepared.