Concept:In biological classification, moving from broad groups to specific groups makes members more similar.
Explanation:Classification ranks are arranged from broad to narrow.
The correct order is Phylum → Order → Genus → Species.
At higher ranks, organisms share only general features.
At species level, organisms share the most detailed characteristics.
Species is the most specific and narrowest category.
Therefore, members of a species are more similar than members of any other listed rank.
Answer:Species (Option C)