The fossilized fish which is found has jaws but no true bones belonging at point B on the Cladogram. Thus, the correct option is B. 
What is Cladogram?
A cladogram may be defined as a phylogenetic tree that is based on the classification of evolutionary relationships. 
In the given cladogram, D is any ancestral point from which speciation occurs. Point C is a basal taxon while A and B are sister taxons. 
The organisms of point B have only jaws bu,t not true bones, while the organisms at point A have both jaws and true bones. 
Therefore, it is well described above. 
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