David States That the Appropriate Subject Matter for Students of Human

Multiple Choice

David states that the appropriate subject matter for students of human development to study is how people act. He argues that scientists have no business studying how people think or feel, because thoughts and feelings cannot be directly observed. David's ideas are most similar to those advocated by:

A) B. F. Skinner and Ivan Pavlov
B) Sigmund Freud and Erik Erikson
C) Lev Vygotsky
D) Jean Piaget