The correct answer is letter C
Of the different personality verification systems in the world, the MBTI (Myers-Briggs Type Indicator) and the Big Five, or Model of the Big Five Factors, are the most researched when it comes to introversion. The Big Five Personality Theory is the best known. She sees introversion taking place along a continuum with "extroversion". You either have more or less extroverted traits. MBTI had a large influence on business, coaching and counseling. MBTI describes Introversion not as a model, but as a basic trend. Introverts will have different personalities based on their biology, learning and experiences.