The correct answer is d. Hans and Sybil Eysenck
According to Eysenck & Eysenck, our personality is primarily influenced by biological factors, namely our genetically inherited traits. According to Eysenck, hierarchical personality traits that encompass several sub-traits are genetically inherited. These hierarchical traits are extraversion, neuroticism and psychoticism. Eysenck & Eysenck also claimed that we are born with certain temperaments that only have an underlying biological basis.
