Which of the following refers to the very private and internal mental processes that the behaviorists avoided studying—information processing, thinking, reasoning, and problem solving?

Cognition

Explanation:

Behaviorism takes observable behavior into consideration and not cognition. Although behaviorists usually accept that cognitions and emotions exist, they rather avoid studying them as they consider that it is only possible to measure visible behavior in the framework of scientific and objective procedures. In this way, the resources to explain these internal events are behavioral terms.