Final answer:
The appropriate person to notify in the case of unusual behavior of a member is the Chief Medical Officer, who is equipped to handle health-related issues within the organization.
Step-by-step explanation:
When a member of an organization is behaving unusually, the proper course of action is to provide notification to the appropriate authority within the organization. This question seems related to protocol within a structured organization, such as emergency services or the military. Based on the quotation provided for reference, which speaks of seeking an opinion in writing from a principal officer regarding their duties, the best course of action would likely be to notify the Chief Medical Officer (B). This is because the Chief Medical Officer would have the most relevant professional expertise to assess and respond to behavioral health issues.