Use the Following Information for Questions

Multiple Choice

Use the following information for questions:
A group of women suffering from various types of obsessive fear is given a therapeutic course to learn how to handle their fear. At the end of the course the women are given a questionnaire to determine how afraid they are. Six months after the course the women answer the questionnaire again as a follow-up measure. The fear-scores are typed into SPSS. Output of the paired samples t-test is shown below.
-Based on Cohen's interpretation, this effect is

A) a small effect, not obvious without statistics.
B) a medium effect, obvious to careful observers.
C) a large effect, obvious to most observers.