I think the correct answer is D because geographer can explain thinks about earth, but not about people's feelings - that's job for sociology or psychiatry
A geographer role is to access all the phenomenon in terms of the time, place and the space frameworks as he can tell about the impacts of the natural environment on the lives of the mankind his interaction with the natural world as dynamic and his footprints on the valuable resources of the country.
The geographer can tell how why the river valleys are the most populated place on rearh and also explain why man lives in communities but he cannot predict why people are like others.
That is a psychological aspect and that most of the geography is based on understanding the elements of the physical world.
