A serious concern with history effects is that
A)they can never be controlled for.
B)they prevent a researcher from concluding that an outcome is the result of experimental manipulation.
C)a researcher may be unaware that they have threatened the validity of an experiment.
D)they tend to inflate observed sales levels.
E)the only way to eliminate them is to conduct a fully controlled field experiment.

Question

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The Answer of A serious concern with history effects is that
A)they can never be controlled for.
B)they prevent a researcher from concluding that an outcome is the result of experimental manipulation.
C)a researcher may be unaware that they have threatened the validity of an experiment.
D)they tend to inflate observed sales levels.
E)the only way to eliminate them is to conduct a fully controlled field experiment.

A Serious Concern with History Effects Is That