Answer:
B. hypnosis.
Step-by-step explanation:
Hypnosis refers to the mental state of a person in which he experiences a focused attention, low peripheral awareness and a heightened capacity to respond to the suggestibility. It is used to relax paining sensation or to acquire a behavioral change. During the state of Hypnosis, a person have increased concentration and focus. Though there are different techniques to employ such a stage, the result varies from person to person.
As per the question, Katie experienced the stage of Hypnosis.