How do you debug an application with an Accept step?

How do you debug an application with an Accept step?

A.
Select Start from the Debug pulldown, then call the trigger.

B.
Select Step Over from the Debug pulldown, then call the trigger.

C.
Call the trigger, and when the workflow answers, select Start from the Debug pulldown.

D.
Select Reactive Application, then call the trigger and press F10 to step through the workflow.

Explanation: