The five areas that account for the largest portion of work conducted by I/O psychologists are training and development, organizational development, selection, quality of work life, and:

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The five areas commonly studied in I/O psychology are chosen based on their practicality and contribution to organizational productivity. While compensation may also be a commonly studied area, it is not one of the most significant areas of focus for I/O psychologists. Human factors do fall under the umbrella of I/O psychology, but they are not one of the five specifically identified areas. Quality of work life has become increasingly important in recent years, but it is not as universally studied as the other five areas. Therefore, the best choice is C - performance appraisal, as it is consistently cited as one of the most important areas of study for I/O psychologists, essential to evaluating employee performance and improving organizational outcomes.

The Five Areas That Account for the Largest Portion of Work