Answer:
Stop project work and create the WBS, and don’t let work continue until it’s created
Step-by-step explanation:
The WBS refers to the Work breakdown structure in which the work is divided into many parts so that it is easy for each one to work upon it as it does not the pressure for only one person. It's better to divide the work so that it would be completed within a prescribed time
Since in the given situation, as there is no WBS so for that first we have to stop the work after that the WBS should be created and only after the work is started that means until WBS no work will started
Hence, the b option is correct