Answer:
observer effect
Step-by-step explanation:
In psychology, the observer effect is described as a phenomenon in which there's a possibility that a specific act or behavior of observation might affect the different properties of the thing (what) is being observed. Therefore, it can reflect effects depending on an entirely different nature utilizing a specific mechanism and context.
In other words, it refers to the act of observation that can influence a particular phenomenon that is being observed.
The correct answer is observer effect.