Answer:
C : the inheritance of behavioral and psychological traits
Explanation:
Genetics can be defined as the scientific study of hereditary in living organisms such as humans, animals and plants.
Heredity refers to the transfer of traits (specific characteristics) from the parent of a living organism to her offspring through sexual reproduction or asexual production. Some examples of hereditary traits are dimples, tongue rolling, baldness, handedness, freckles, curly hair, color blindness, height, etc.
As a behavioral geneticist, Juan would most likely be studying the inheritance of behavioral and psychological traits.
For example, Juan as a behavioral geneticist would most likely study a gene that is typically responsible for behavioral and psychological traits such as an aggressive behavior, shyness, anger, talkativeness, lying, etc., in living organisms (humans).