Now, short term before the event, you receive various cancellations by team members, who say that they cannot join the meeting?

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The answer depends on the length of time between the date of the meeting and the date of the start of the project. If there is enough time to arrange another meeting, the answer is D . If the period is short, the answer is B.

Thanks for invitation

Option D

D. It is probably a good idea to reschedule the meeting to a day, when all teammembers can attend.

• In the context of teamwork, kick-off meeting is important.So, everybody should be present 
• When the team members say they can not attend, then they are not ready  for the meeting or busy with some other issues.
• Still, if you insists to attend, the final  result for such important kick-off meeting will not be very fruitful.

So, the best option is to reschedule the meeting (OPTION-D)  and stating the importance of  the meeting, request the team members in writing to confirm attendance  by return mail 

B. You should insist on the presence of the team members to the appointed date.