Final answer:
To maintain confidentiality when a patient is unable to communicate and a family member must be present, the step that must be taken is to share only essential information.B. Share only essential information
Step-by-step explanation:
When a patient is unable to communicate and a family member needs to be present, maintaining confidentiality is still important. The step that must be taken to maintain confidentiality in this situation is to share only essential information with the family member. This means providing them with the necessary details about the patient's condition or treatment, but not disclosing any additional unnecessary information.