D and E
Explanation:
The organisms are classified on the basis of their similarities and dissimilarities.
The taxonomic ranks are: Kingdom > Phylum> class > Order > family > genus > species.
As we move from kingdom towards the species the degree of similarities increases i.e. organisms that are grouped within a kingdom may have greater number of dissimilarities among them again more similar organisms are grouped into phylum, further organisms whuich are more similar within a phylum are grouped into class and this goes on.
In a species the individuals are very similar and have least number of dissimilarities among them.
In the given situation, A,B and C are of same class But they are in different order but C,D and E are of same order.
So C is more similar to A and B when compared to D and E.
Thus, D and E are expected to show greatest degree of structural homology.
