A Medical Journal Published the Results of an Experiment on Depression

A medical journal published the results of an experiment on depression. The experiment investigated the effects of a controversial new therapy for depression. Researchers measured the depression levels of 47 adult women who suffer moderate conditions of the disorder. After the therapy, the researchers again measured the women's depression levels. The differences between the the pre- and post-therapy depression levels were reported. What is the treatment in this experiment?

A) the differences between the the pre- and post-therapy depression levels
B) the 47 adult women who suffer from depression
C) the therapy
D) the disorder ( depression or no depression)

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