Final answer:
The correct proposition of interactional psychology is that an important aspect of a person's situation is their own subjective view of it, emphasizing continuous and reciprocal interactions between the person and the situation.
Step-by-step explanation:
The proposition of interactional psychology that you're referring to is number 4: One of the important aspects of a person's situation is the person's own subjective view of that situation. Interactional psychology suggests that behavior is a function of continuous and bidirectional interactions between a person and their situation. This perspective recognizes that an individual's behavior is influenced by both situational factors (like culture, social roles, and the presence of bystanders) and personal factors (such as personality traits and temperament). People are actively involved in interpreting their situations and not passive, as proposition 3 implies. The cognitive, affective, motivational, and ability factors of people, as mentioned in proposition 2, do indeed vary, and this variability is considered by interactional psychologists. Also, contrary to proposition 1, interactional psychology argues for a continuous and reciprocal interaction between people and situations.