Step 1: Concept
Phylum names often describe the defining characteristic of the group.
Step 2: Meaning
The name "Arthropoda" comes from the Greek words \textit{arthros} (joint) and \textit{poda} (foot/leg).
Step 3: Analysis
Arthropods, which include insects, spiders, and crustaceans, are uniquely characterized by their segmented bodies and jointed limbs.
Step 4: Conclusion
Hence, Arthropoda is the group featuring jointed appendages.
Final Answer:(D)