A Natural Experiment Is an Empirical Study ________

Multiple Choice

A natural experiment is an empirical study ________.

A) in which the predictions of the model are not required to be tested with data
B) that can only be used to understand natural phenomena and is widely used in subjects such as physics and biology
C) in which the researcher assigns subjects to the control and treatment groups to verify a cause-effect relationship
D) in which some process, outside the control of the experimenter, has assigned subjects to the control and treatment groups in a random or nearly random way