A Medical Journal Published the Results of an Experiment on Insomnia

A medical journal published the results of an experiment on insomnia. The experiment investigated the effects of a controversial new therapy for insomnia. Researchers measured the insomnia levels of 32 adult women who suffer moderate conditions of the disorder. After the therapy, the researchers again measured the women's insomnia levels. The differences between the the pre- and post-therapy insomnia levels were reported. What is the response variable in this experiment?

A) the therapy
B) the 32 adult women who suffer from insomnia
C) the disorder ( insomnia or no insomnia)
D) the differences between the the pre- and post-therapy insomnia levels

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