Final answer:
High self-monitoring is the personality trait that describes individuals who can adapt and adjust their behavior to external factors.
Step-by-step explanation:
The personality trait that best describes individuals who can adapt and adjust their behavior to external factors is high self-monitoring.
High self-monitoring refers to the ability to regulate and adjust one's behavior based on social cues and the demands of a given situation. Individuals who are high in self-monitoring are sensitive to the expectations and norms of their environment and are skilled at presenting themselves in ways that are appropriate and acceptable.
For example, someone who is high in self-monitoring may behave differently when interacting with their boss in a professional setting compared to when they are with their friends in a casual setting. They are able to adapt their behavior to match the expectations of each situation.