Fresh day Eniola, let's solve. Step 1: Identify the phylum in question. The question asks about the Phylum Annelida. Step 2: Recall the excretory organs of Annelids. Annelids, such as earthworms, primarily use nephridia for excretion and osmoregulation. Step 3: Evaluate the given options. A. Flame cells* are characteristic of Platyhelminthes (flatworms). B. Nephridiophore* is the external opening of a nephridium, not the organ itself. C. Nephridia* are the tubular excretory organs found in many invertebrates, including annelids. D. Parapodia* are fleshy appendages used for locomotion and respiration in some annelids (polychaetes), not excretion. Step 4: Select the correct option. Based on the function, nephridia are the main excretory organs of Annelida. The final answer is $\boxed{\text{C}}$ Send me the next one 📸