Answer:
social facilitation
Step-by-step explanation:
The improvement of the performance of group members rather than working alone is social facilitation. It is hypothesized that having someone that is observing a person while working motivates them.
However, the person performing a task must be competent at the task they are performing. A person who is not competent at the task shows a degradation of performance.
Hence, the statement here is referring to social facilitation.