D and E
Explanation:
As we move from a higher rank to a lower rank in the taxonomic hierarchy, the degree of similarities increases.i.e. the degree of similarities increases from kingdom to species. Species contain the individual who are most similar and can interbreed among themselves.
Since, A , B and C belong to same class while C, D and E belong to same order, the degree of similarity between C,D and E will be more than that of the degree of similarity between A, B and C.
Again since C belongs to the class of A and B ,it will be more distant from D and E.
Thus D and E will be more similar than D and C or E and C.
