A Cladograma is a branched diagram used to scheme the phylogenetics of the living things, so it can tell the evolutive history.
So in the center, you would have the common ancestor, and from that hypothetical ancestor the branches would be getting apart due to the mutations, so, the farthest away group would be those who have less in common, so in this case, those who do not have things in common. the answer would be B.