As Part of a Patient's Treatment Plan, She Was Admitted

As part of a patient's treatment plan, she was admitted to the hospital for observation. This means :

A) the patient needs to be admitted to the hospital to undergo further tests before she can be diagnosed.
B) the patient will be discharged with a prescription.
C) the patient will be in the hospital so that medical professionals can watch, or keep an eye on, her.
D) the patient will be sent home to see if the symptoms get better on their own.
E) the patient's symptoms resolved after her hospital stay.