Identify a True Statement About Descriptive Field Studies

Identify a true statement about descriptive field studies.

A) They are often high in external validity because a sample of participants can be taken directly from a population of interest.
B) They are often high in internal validity because an experimenter can randomly assign participants to treatments and manipulate one or more independent variables.
C) In these studies, a researcher makes inferences about causality based upon the results from a study.
D) In these studies, a researcher sets up a situation to resemble one that is naturally occurring rather than observing participants in real-life settings.