Answer:
B. lose track of their immediate surroundings
Explanation:
A trance induced by the use of hypnosis; the person accepts the suggestions of the hypnotist. trance - a state of mind in which consciousness is fragile and voluntary action is poor or missing; a state resembling deep sleep.
It is typical for people in hypnotic trances to temporarily lose track of their immediate surroundings.
They do what the hypnotic therapist asks them to do and he loses all sense of their immediate surroundings.