Final answer:
Certain traits like eye color and earlobe shape are solely inherited from our parents, but traits like intelligence and social standing are influenced by a combination of genetics and environmental factors. The correct option, given the context, is that multiple factors influence an individual's intelligence level.
Step-by-step explanation:
The question of which factors depend solely on inheritance from one's parents revolves around the concepts of heredity and genetics, which are central to understanding traits that are passed down through generations. Characteristics like eye color, earlobe shape, and certain genetic predispositions are inherited from our parents and do not depend on environmental factors.
It is important to recognize, however, that while certain traits are purely inherited, the expression of these traits can be influenced by the environment, making the distinction between nature and nurture quite complex. For instance, natural selection operates on traits with a genetic basis, and social standing is frequently inherited, affecting access to resources and opportunities that can influence outcomes such as educational attainment.
Considering the provided context, the mentioned correct option in the final answer would be option d, which states, "There are many factors working together to influence an individual's intelligence level." While genetics contributes to intelligence, it is not the sole determinant as environmental factors also play a significant role.