Under the deep analysis of the interrelations between Hans Eysenck's three-factor (PEN model) theory of personality—Psychoticism, Extraversion, and Neuroticism—and William Herbert Sheldon's somatotype-based classification, if an individual is found to be highly aggressive, socially aloof, risk-taking, and simultaneously possesses high 'Psychoticism' on Eysenck's scales along with a 'Mesomorphic' physique according to Sheldon's classification, which of the following statements is most authentic and scientific regarding the psychological and biological structure of this type of personality?

Understanding Personality Theories: Eysenck and Sheldon

Hans Eysenck proposed the biological-factor PEN model (Psychoticism, Extraversion, Neuroticism), emphasizing genetics, hormonal balance, and the autonomic nervous system in personality determination. William Sheldon categorized personality based on physical build (Somatotypes: Endomorphy, Mesomorphy, Ectomorphy).

• Mesomorphs possess muscular and robust builds, often correlating with assertiveness, risk-taking, and aggression.
• These traits strongly overlap with high Extraversion and Psychoticism in Eysenck's biological model, often mediated by physiological factors like testosterone.

Conclusion: Option (b) scientifically integrates the biological underpinnings of both somatotypes and factor-analytic personality traits.