In studying human behavior, contemporary psychologists rely most heavily on question options: 1) introspection. 2) psychoanalysis. 3) massed practice. 4) science.

Contemporary psychologists rely most on science when studying human behavior. This psychology approach studies human behavior and how it is related to stimulus and response. Behaviorists analyze measurable actions and their effects on the way people act. Introspection and psychoanalysis, on the other hand, do not study actions as they are more concerned with the subconscious, feelings and emotions. As regards massed practice, it is an educational process used to refer to long and intense training lessons.

i got 3,4 and 5 as an answer