A vendor who is scheduled to arrive in two days encounters a delay and needs to reschedule the visit. The project manager needs a timely response from the project sponsor regarding the delay; however, the sponsor is in an all-day meeting and is not responding to email.
Which of the following is the BEST method to get the sponsor's attention?

A. Schedule an urgent meeting, overbooking one of the meetings.
B. Delegate to the project coordinator.
C. Text the sponsor asking for advice.
D. Interrupt one of the meetings to speak to the sponsor.