[A]: Humans and great apes have a common ancestry.
[R]: Man and chimpanzee have similar band- ing pattern of chromosomes number 3 and 6.
A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false