Answer:
b) Eysenck
Step-by-step explanation:
The introversion and extroversion are the personalities of the humans based on which many psychological theories has been published.
The theory by Hans Eysenck correlated these two personalities of humans to the differences in the physiology of the brain. He associated the personalities to a pathway located in the brainstem of the brain called the ascending reticular activation system (ARAS). The ARAS system mediates the state of arousal of learning and wakefulness and stimulates and inhibit the cortex.
The extrovert does things to raise the low level of ARAS arousal whereas the introverts show their characteristics to avoid the higher level of ARAS arousal.
Thus, Option-B is the correct answer.