Task: Question Answering
Input (English): Question: What do behavioral treatments for major depressive disorder have in common? 
 Options:  <1> The use of exposure techniques to stressful situations. <2> The main objective of modifying maladaptive beliefs and assumptions that make a person vulnerable to depression. <3> Which are unstructured therapies and without a limited number of sessions. <4> The main objective of increasing the positive reinforcement received by the depressed person. <5> The main objective of relating depression to problematic interpersonal situations.
Output (English): 4