In order to understand the unusual behavior of an adult client, a clinical psychologist has carefully investigated the client's current life situation and his physical, social, and educational history. which research method has the psychologist employed?

Case study

Explanation:

Case study is known to be a type of research method which aims to do a comprehensive investigation and analysis of a subject or person, situation and so on. With the use of this method, comprehensive observations can be made by researchers and it can be carried out with tools such as observations, artifacts, interviews, survey and so on. Thus, it is a research method which is popularly used by social scientists.

the answer is solomon northrup. he was a free-born african american, abolitionist and professional violinist that was drugged, kidnapped and sold as slave in 1841 and remained in captivity until 1853 where he regained his freedom with the of the then-governor of new york, washington hunt. he wrote and published his memoirs "twelve years a slave" in 1853, and in this text, he tells the story of his escape thru one of louisiana's swamps (the great pacoudrie swamp) in which he ended up covered in green slime from crossing the surface of the dead water.