Dr. Clarkson is treating a client with obsessive-compulsive disorder (OCD). He learns that the client’s parents divorced and she has never felt loved because her father left the family. By looking for the issues that led to the development of her OCD, Dr. Clarkson is

attempting to determine etiology

Explanation:Etiology in psychology Rees to factors that have caused an individual to develop a certain disorder. Mental and psychological disorders have been found by psychologist to be caused by internal factors , loss, pain and environmental factors and this is why Dr Clarkson is trying to establish these factors because they are crucial in making psychological diagnosis.

i think it is the third one.

i truly dont know the answer wait i do its 1,3,4