What is preventing the drip feed from triggering?

Northern Trail Outfitters is implementing drip feed dispatching. When testing the new functionality, the drip does not dispatch appointments as expected. A consultant is engaged to troubleshoot the issue.

What is preventing the drip feed from triggering?
A . The appointment status is going from Scheduled to Completed.
B. The status on completed appointments can only be Canceled, Completed, or Cannot Complete.
C. The default drip feed setting is overriding the drip feed rate on a service territory.
D. Other scheduled jobs are dispatching appointments and exceeding the drip feed value.

Answer: B