Final answer:
Self-concept in psychology is influenced by both biological and environmental factors, suggesting that both nature and nurture play critical roles in its development.
Step-by-step explanation:
In the study of psychology, when considering whether self-concept is influenced more by biological factors than environmental ones, it is important to examine evidence from both sides of the nature versus nurture debate. Genetics and biological traits do indeed play a role in self-concept formation. However, social interaction and environmental factors such as culture, social class, and early childhood experiences are also crucial in shaping an individual's self-concept. Sociologists and psychologists agree that both biological and environmental factors contribute to the development of self-concept, rejecting the notion that environmental factors are negligible (option c) or that socialization has limited influence (option d).