Answer: A. evolutionary history through the use of a branching tree.
Step-by-step explanation:
Cladistics is a branch of biological science which includes the methods of relating hypothetically newly originated organisms with their ancestors by reconstructing evolutionary trees on the basis of similarities of the traits found and observed in the fossils of the primitive organisms and the present species. The group in which the organisms are categorized on the basis of the similarities present in them is called as clade.
Evolutionary history through the use of a branching tree is the correct explanation for defining cladistics.