Cisco.Press.CCNP.Wireless.642-732.CUWSS.Quick.Reference.2nd.Edition.May.2012 Page 33 -

Also check for areas that may be difficult to access (for example, clean rooms in hospitals, hard-to-reach areas, hazardous environments with nearby chemicals or machinery, outdoor APs on poles in busy streets) and may require specific conditions for access (specific time slots or equipment).

The test answer is B, but in the real world it would be D. Today's OR's can often use wireless transmitters and sensors during operations. Any Engineer worth their salt would insist on returning to complete these areas, rather than rely on a Predictive tool of any kind!

The answer is not clear cut. Correct me if I'm wrong.
The question states " he or she should not enter any active surgery suites" emphasis on NOT and ACTIVE. So if they are not allowed in, how can they do passive surveys? They can not enter as the surgery suites are active, meaning actively busy with surgery/operations.

Would this then not be the same as the warehouse where an area were not accessible due to obstruction. In this case they are not allowed in/couldn't enter.

A passive survey can't be done. So then the correct answer will be B. (WCS tool)