Radcliffe-Brown has brought about much clarity of thinking in the field of kinship studies by his scientific treatment of the subject. Which among the following are correct about his contributions?

A. He studies kinship systems with no preconceived notions regarding evolution as did Morgan.

B. Not rejecting any conjuctural attempts at discovering origin.

C. He studied kinship systems functionally and from the synchronic point of view.

D. He did not study kinship systems.

Choose the correct answer from the options given below: