What error has been made in this diagram?

Below is a business process model for a goods ordering process:

What error has been made in this diagram?
A . The arrowed flow mine from Fulfil order should go to the end node ( the bull eye) not to the task received:
B. The arrowed flow line from Complete order should go to check stock availability not to the decision diamond.
C. The task’Complete order’s should be In only one swimlane, as tasks straddling two swim lanes are not permitted.
D. The task’ Cancel order’ should be rename Order cancelled as by this point in the process the order has been cancelled.

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Answer: B