Researchers extracted DNA from blood samples obtained from two sisters and a brother affected by DYT2. The siblings' parents were neurologically normal, and there were no other DTY2 cases within the family.

Is the disease


A.
It is recessive because the father was neurologically normal and it is autosomal.
B.
It is dominant and because the mother was neurologically normal and it is autosomal.
C.
It is recessive and because the father was neurologically normal and it is X-linked.
D.
It is dominant and because the mother was neurologically normal and it is X-linked.