Final answer:
A personality researcher would classify Vicki as an External because she believes that whether people make a lot of friends depends on external factors like the kind of job a person gets and the types of people who move into their neighborhood. So, the correct answer is option a.
Step-by-step explanation:
A personality researcher would probably classify Vicki as an External because she believes that whether people make a lot of friends depends on external factors such as the kind of job a person gets and the kinds of people who move into the person's neighborhood.
This classification is based on Carl Jung's theory of personality, which includes the attitudes of extroversion and introversion. Extroverts are energized by being outgoing and socially oriented, while introverts derive their energy from their inner psychic activity.
So, the correct answer is option a.