Final answer:
The three key competencies of flexibility, problem solving, and reality testing are associated with the subject of Intelligence in the field of Psychology.
Step-by-step explanation:
The three key competencies of flexibility, problem solving, and reality testing are associated with the subject of Intelligence in the field of Psychology. These competencies are important aspects of cognitive empathy, which involves understanding the perspectives of others and effectively navigating social situations. Cognitive empathy develops during adolescence and plays a vital role in social problem solving and conflict resolution.