Final answer:
The appropriate action for the nurse is to respect the client's wishes and continue to monitor their condition.
Step-by-step explanation:
When caring for a client who is a Jehovah's Witness and refuses consent for blood administration, the nurse should respect the client's wishes and continue to monitor their condition (C).
As healthcare professionals, it is important to uphold a patient's autonomy and respect their religious beliefs. By continuing to monitor the client's condition, the nurse can ensure the client's safety and well-being while adhering to their wishes.
The nurse should also explore alternative treatment options that are acceptable to the client, such as administering medications to stabilize blood pressure or performing a surgical intervention if needed. It is crucial for the nurse to communicate with the healthcare team and involve them in finding appropriate alternatives.