An industrial/organizational psychologist has been consulting with a company that runs weekend job-seeking workshops for the unemployed. She collected data on several issues related to these workshops and, after conducting statistical tests, obtained statistically significant findings. She needs to find a way to evaluate effect size so that she can make recommendations to the company. One of the psychologist's findings is that 18 months after the workshop, a sample of 49 job seekers who received training on setting career goals scored an average of 6.5 as measured on a 9-point job search satisfaction scale, with a standard deviation of 1.2.The typical job seeker scores 5.8 points. The psychologist finds that the estimated Cohen's d is:

a. 0.583
b. 0.015
c. 4.084
d. 0.438