Which of the following is true regarding observation in psychological research?单项选择题

A

An observational study/design is experimental research conducted in a naturalistic setting, so it allows to identify causal relationship between two variables

B

Observational research/design guarantees that participants' behavior is unaffected by the awareness of being observed.

C

The technique of observation can be used within both experimental and non-experimental designs

D

The independent variable is usually manipulated in a study with observational design

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