Final answer:
According to social facilitation, an individual's performance on easy tasks declines in the presence of others due to increased self-consciousness.
Step-by-step explanation:
According to the process of social facilitation, when the presence of others is physiologically arousing, a person's performance tends to decline on tasks that are easy. This is because when individuals are surrounded by others, they may become more aware of their own performance and this heightened self-consciousness can interfere with the execution of tasks that are usually performed without much thought. However, for difficult tasks, the presence of others can actually improve performance through increased motivation and effort.