University of British Columbia Researchers Lam and Levitt (1999)have Found

University of British Columbia researchers Lam and Levitt (1999) have found which of the following about the effectiveness of phototherapy?

A) Phototherapy improves SAD and associated symptoms.
B) Phototherapy alleviates SAD but not the associated suicidal tendencies.
C) Phototherapy alleviates associated symptoms of SAD such as suicidal tendencies but not the disorder itself.
D) Phototherapy is only occasionally successful in treating SAD.