A potential solution to the problem of drawing causal inferences based on the natural groups design is to use a complex design involving a natural groups design for an individual differences variable along with a manipulated independent variable. An important key to this potential solution is to
A. obtain a main effect of the individual differences variable but not of the manipulated independent variable.
B. obtain a main effect of the manipulated independent variable but not of the individual differences variable.
C. obtain main effects of both the individual differences variable and the manipulated independent variable.
D. obtain an interaction effect of the individual differences variable and the manipulated independent variable
D. obtain an interaction effect of the individual differences variable and the manipulated independent variable
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