Select the option with a correct representation of phylum of animal to the below - mentioned features :
I. The body is supported by a skeleton made up of spicules or spongin fibers with choanocytes line the spongocoel.
II. Specialized cells called flame cells help in osmoregulation and excretion.
III. The body bears eight rows of ciliated comb plates which helps in locomotion.
IV. The alimentary canal is complete with the well developed muscular pharynx.

Options

A. `{:(I,II,III,IV),("Echinodermata","Platyhelminthes","Cnidari","Arthopoda"):}`
B. `{:(I,II,III,IV),("Echinodermata","Nematoda","Ctenophora","Annelida"):}`
C. `{:(I,II,III,IV),("Porifera","Aschelminthes","Echinodermata","Platyhelminthes"):}`
D. `{:(I,II,III,IV),("Porifera","Platyhelminthes","Ctenophora","Aschelminthes"):}`

Answer

To solve the question, we need to analyze each of the four features and identify the corresponding phylum of animals.

### Step-by-Step Solution:

1. **Feature I: The body is supported by a skeleton made up of spicules or spongin fibers with choanocytes lining the spongocoel.**
- This feature describes sponges, which belong to the phylum **Porifera**.

2. **Feature II: Specialized cells called flame cells help in osmoregulation and excretion.**
- Flame cells are characteristic of flatworms, which belong to the phylum **Platyhelminthes**.

3. **Feature III: The body bears eight rows of ciliated comb plates which help in locomotion.**
- This feature is indicative of comb jellies, which belong to the phylum **Ctenophora**.

4. **Feature IV: The alimentary canal is complete with a well-developed muscular pharynx.**
- This feature is typical of roundworms, which belong to the phylum **Nematoda** (also known as Aschelminthes).

### Conclusion:
Based on the analysis of each feature, we can summarize the corresponding phyla as follows:
- Feature I: Porifera
- Feature II: Platyhelminthes
- Feature III: Ctenophora
- Feature IV: Nematoda

Now, we need to select the option that correctly represents these phyla.

### Final Answer:
The correct option is **D**, as it correctly lists the phyla corresponding to each of the features provided.