Quasi-Experimental Designs Lack the Controls of Strong Experimental Designs

Multiple Choice

Quasi-experimental designs lack the controls of strong experimental designs.

A) however, causal inferences can be made to the extent that rival hypotheses can be ruled out
B) as such, causal inferences should never be made
C) however, in most cases such deficiencies can be safely ignored
D) thus, such studies should not be performed by ethical researchers