The tendency of people to perform simple or well-learned tasks better when others are present is the original meaning of

social facilitation

Explanation:

This ability or improvement in teh performance of a person when they work in the presence of others is called social facilitation.

The definition was first put forward in 1898 by Norman Triplett; in 1920 psychologist Floyd Allport classified it as social facilitation.

For example, assume your employer has asked you to perform a fairly simple job, such as cleaning up a specific area of work. Social facilitation theory suggests that if there were people watching you when you were working, you'd probably go the extra measures to put it in its place and make the area very clean.

Hence, the correct answer is social facilitation.

substitution is the answer in this case