Which among the following are true according to Karl Mannheim about sociology of knowledge?

A. All knowledge and all ideas are bound to a location.

B. It refers to a theory of the social or existential conditioning of thought.

C. Ideas are rooted in different locations in historical time and social structure.

D. At times a particular group can have full access to the understanding of a social phenomenon than other groups.

E. No group have total access to understanding of a social phenomenon.

Choose the correct answer from the options given below: