When Administering Oxygen to a Hypoxic Patient, What Signs Would

When administering oxygen to a hypoxic patient, what signs would seemingly indicate that the patient is improving?

A) The heart rate drops from 120 to 80 beats per minute.
B) The patient becomes more restful and wants to sleep.
C) The blood pressure increases from 136/78 to 150/86 mmHg.
D) The respirations slow from 24 to 22 per minute.