It is most accurate to say that
a. because they are correlational in nature, valid conclusions can never be drawn from quasi-experimental research designs.
b. quasi-experimental research will generally have higher internal validity in comparison to true experiments.
c. although they will generally have some threats to internal validity, quasi-experiments can sometimes be used to draw inferences about the causal relationships among variables.
d. quasi-experiments are less scientific than other types of research designs.
c
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