Final answer:
The nurse can be sued for malpractice because the action was below the standard of practice.
Step-by-step explanation:
The nurse should understand that they can be sued for malpractice because the action was below the standard of practice (option c). Malpractice occurs when a healthcare professional fails to provide the standard of care that a reasonable practitioner would have provided in a similar situation. In this case, the nurse made a medication error by administering the wrong dose, which resulted in a severe hypotensive episode and the need for ICU transfer. The nurse should expect to face legal consequences and may be held liable for the harm caused to the client.