The Circulating Nurse Notes That the Anesthetized Patient Has Tensed

The circulating nurse notes that the anesthetized patient has tensed muscles and irregular respirations. The nurse is aware that the patient has reached stage:

A) I and the patient's hearing is amplified.
B) II and the surgical environment should be kept quiet.
C) III and the patient has depressed reflexes.
D) IV and the patient will not depend on the anesthesia machine of oxygenations.