Final answer:
The correct answer is c) 'It is one of two basic personality dimensions' in Eysenck's model of personality, which includes extraversion-introversion and neuroticism-stability.
Step-by-step explanation:
In Eysenck's model of personality, the dimension of extraversion-introversion is one component, and it refers to the tendency for a person to be sociable and outgoing or reserved and solitary. This trait is considered one end of a spectrum, with extraversion on one side and introversion on the other. Opposite this dimension is neuroticism-stability, which deals with emotional stability.
This means that option c) 'It is one of two basic personality dimensions' in Eysenck's model is the correct answer. To clarify, the Big Five personality traits, which include extraversion as one of its dimensions, is a different model that consists of openness, conscientiousness, extraversion, agreeableness, and neuroticism, and it is separate from Eysenck's binary dimension approach.