What Did a Review of the Literature on the Effectiveness

What did a review of the literature on the effectiveness of group therapy for HIV-positive individuals conclude?

A) Although further study is needed, psychosocial interventions are helpful for enhancing psychosocial functioning but have no effect on physical functioning such as immune system activity.
B) Although further study is needed, there seem to be positive effects in patients with advanced-stage disease, but no effects have been observed in those in a very early, asymptomatic stage of the disease.
C) Although further study is needed, group interventions have produced no noticeable improvements in either physical or psychological functioning of these patients.
D) Although further study is needed, there seem to be positive changes in immune and endocrine activity associated with structured group interventions.