People’s behavior changes when they know they are being observed.
a) this is known as reactivity; it is also called the hawthorne effect, after a manufacturing plant where the phenomenon was documented.
b) a common reason for this phenomenon is that people like to make a positiveimpression on their observer.
c) in surveys, this creates a bias toward – answers.
d) this pattern is called socially desirable responding, or faking good.

The answer is a)This is known as reactivity; it is also called the Hawthorne effect, after a manufacturing plant where the phenomenon was documented.

Explanation:

The Hawthorne effect is a type of reactivity where individuals modify their behaviour tdue to the fact that they are being observed. This can influence research in a negative manner. The effect got its name due to a research done in a "Hawthorne works" factory where this phenomena was first noticed.

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your friend,