Based on the criterion of segmentation, which organism most closely resembles the earliest ancestral arthropod?

Question

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The earliest ancestral arthropod is thought to have had multiple similar segments, each with a pair of appendages. The millipede also has numerous segments with paired appendages, similar to the early ancestral arthropod. The other organisms listed have more specialized and differentiated segments, which are thought to have evolved later in arthropod evolution.

Based on the Criterion of Segmentation, Which Organism Most Closely