A natural experiment is an empirical study: A) in which the predictio

A natural experiment is an empirical study:

A) in which the predictions of the model are not required to be tested with data.
B) in which some process, outside the control of the experimenter, has assigned subjects to control and treatment groups in a random or nearly random way.
C) in which the researcher assigns subjects to control and treatment groups to verify a cause-effect relationshi

ANSWER

B