Final answer:
The nurse's decision to remove the restraints displays the ethical principle of autonomy.
Step-by-step explanation:
The nurse's decision to remove the soft wrist restraints for a client who no longer requires them displays the ethical principle of autonomy. Autonomy is the principle that recognizes and respects a patient's right to make decisions about their own healthcare. By removing the restraints, the nurse allows the client to exercise their autonomy and regain control over their own body.