A Clinical Researcher Was Interested in Determining Whether Her Interventions

A clinical researcher was interested in determining whether her interventions were effective in minimizing depression symptoms among participants.To assess the effectiveness of the treatment program, she administered a depression inventory prior to treatment and after treatment.She hypothesized that depression scores would be lower at time two compared to time one.She then compared the mean differences between the two groups and found that the treatment was effective.The researcher's hypothesis is:

A) one-tailed.
B) two-tailed.
C) not supported.
D) supported by null hypothesis.