In a System of Double Descent,as Among the Yako of Nigeria

In a system of double descent,as among the Yako of Nigeria:

A) Kinship is of no importance,and one can call on whichever individuals one wants for aid.
B) An individual belongs to the patrilineal group of the father and the matrilineal group of the mother.
C) Kinship is important,but there are no corporate kin groups.
D) Kinship is doubly important,because there are no other units of cooperation.
E) Each married couple makes a joint decision about whose kin they will live with.