Parsons' conceptualization of trait and factor theory is now known as __________ interaction theory.

Parsons' conceptualization of trait and factor theory is best referred to as person-environment interaction theory because it emphasizes the relationship between individual characteristics (traits) and the demands of the environment (factors). This theory is foundational in understanding how personal attributes such as skills, interests, and values interact with external factors like job requirements and work environments to influence career choice and satisfaction.

By focusing on the interaction between the person and their environment, this approach underscores the importance of matching individual traits with environmental factors, which can lead to more effective career guidance and counseling practices. This theoretical framework is essential for rehabilitation counselors as they assess clients' abilities and preferences to facilitate successful integration into suitable work environments.

The other options do not accurately capture this dual focus on both the individual and the environment, which is critical to Parsons' original theory.