Answer:
Stress inoculation training
Explanation:
SIT is a type of cognitive behavior therapy. This is used for a different disorder such as post-traumatic stress disorder. For a particular disease, we use a specific vaccination, as in the same way if we get some type of stress we used SIT therapy to avoid the stress.
This therapy is used between 9 to 12 times in a 90-minute session. It is very helpful to the person or group of people.
Thus here in the case of Jenna, the therapist used SIT to help Jenna in avoiding fear, stress during speaking in a large audience.