During a job interview, the person being interviewed will often mirror the interviewer’s behavior. this can be explained by what concept?

The answer is the chameleon effect.

Explanation:

As the name suggests, the chameleon effect takes place when a person imitates another's postures, gestures, mannerisms and other behaviours. This is done in order to fit in with the current context. Some experiments also show that the chameleon effect usually facilitates social interaction.