Answer:
The correct answer is - their inclusiveness.
Step-by-step explanation:
Hierarchical classification is the classification is a system of arranging things according to their characteristics, to different level, orders. A hierarchy is the grouping the organisms in a rank or taxanomic levels such as phyla, order, genra) on their shared characters in each level.
The major principle difference among the taxonomic ranks of the hierarchical classification is based on their inclusiveness, which means how inclusive each group is at every level.
Thus, the correct answer is - their inclusiveness.