Shelby is a very outgoing person who likes being around other people and socializing with them. According to the Big Five trait theory of personality, Shelby would be considered to be:

A. showing signs of her masculine archetypes in her collective unconscious.
B. high on the stable and enduring personality disposition known as extraversion.
C. conditioned through past reinforcements to be uncomfortable in social settings.
D. using defense mechanisms to protect herself from feelings of inferiority.

http://psychology.about.com/od/personalitydevelopment/a/bigfive.htm

According to the Big Five trait theory of personality, Shelby would be considered to be high on the stable and enduring personality disposition known as extraversion.

To understand why this is the case, let's break down the options:

A. Showing signs of her masculine archetypes in her collective unconscious: This option seems to be unrelated to Shelby's personality trait of being outgoing and social. Thus, we can eliminate this option.

B. High on the stable and enduring personality disposition known as extraversion: Extraversion is one of the Big Five personality traits, and it refers to being outgoing, sociable, and drawing energy from being around others. Since the question describes Shelby as an outgoing person who likes being around other people and socializing with them, this option aligns with her personality trait and is the correct answer.

C. Conditioned through past reinforcements to be uncomfortable in social settings: This option suggests that Shelby's discomfort in social settings is a result of conditioning through past reinforcements. However, the question describes Shelby as a very outgoing person who enjoys socializing, which contradicts this option. Thus, we can eliminate this option.

D. Using defense mechanisms to protect herself from feelings of inferiority: This option suggests that Shelby's outgoing behavior is a defense mechanism to protect herself from feelings of inferiority. Again, this contradicts the description of Shelby as an outgoing person who enjoys socializing. Therefore, we can eliminate this option.

In conclusion, based on the information provided, option B, which states that Shelby would be considered high on the stable and enduring personality disposition known as extraversion, aligns with her outgoing and sociable nature.