Task: Question Answering
Input (English): Question: What is the therapeutic objective of Covert Sensitization ?: 
 Options:  <1> Develop an attraction response to a stimulus that was previously a source of aversion. <2> Increase the tolerance to an aversive stimulus and reduce the emotional activation it produces. <3> Postpone immediate positive reinforcers of undesirable behaviors. <4> Develop an aversion response to a stimulus that was previously a source of attraction. <5> Mentally reinforce successful trials aimed at achieving objective behavior.
Output (English): 4