Given the Results of Studies That Have Examined the Effectiveness

Given the results of studies that have examined the effectiveness of insight therapy,which portion of therapy tends to result in the greatest improvement

A)  the first 10 to 20 sessions of therapy 
B)  any portion of therapy that shows evidence of transference 
C)  the latter portions of therapy, after approximately 20 weeks of treatment 
D)  the therapy portion that follows the onset of drug treatment