In an Experiment,a Researcher Manipulates People's Mood to Determine What

In an experiment,a researcher manipulates people's mood to determine what changes in mood cause changes in memory performance.However,the researcher is not sure that the manipulation is really causing people's mood to change.In this case,the research should

A) control mood by holding it constant.
B) control mood by matching it across treatment conditions.
C) add a no-treatment control group in which mood is not manipulated.
D) add a manipulation check by measuring mood.

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