Which of the following is correctly matched?

Options

A. Radial symmetry - Coelenterates
B. Coelomates - Aschelminthes
C. Metamerism - Molluscs
D. Triploblastic - Spongs

Explanation

To determine which of the following options is correctly matched, we need to analyze each pairing based on biological classifications and characteristics.

### Step-by-Step Solution:

1. **Radial Symmetry to Cnidarians**:
- Radial symmetry means that the body can be divided into similar halves around a central axis. This is characteristic of organisms like jellyfish and sea anemones, which belong to the phylum Cnidaria.
- **Conclusion**: This pairing is correctly matched.

2. **Coelomates to Acoelomates**:
- Coelomates are animals that possess a true coelom, which is a body cavity completely lined by mesoderm. Acoelomates, on the other hand, do not have a coelom at all; they are solid-bodied animals without a body cavity.
- **Conclusion**: This pairing is incorrectly matched.

3. **Metamerism to Molluscs**:
- Metamerism refers to the segmentation of the body into repeated units. This characteristic is primarily seen in annelids (like earthworms) and arthropods, not in molluscs.
- **Conclusion**: This pairing is incorrectly matched.

4. **Triploblastic to Sponges**:
- Triploblastic organisms have three germ layers: ectoderm, mesoderm, and endoderm. Sponges, however, are diploblastic, meaning they have only two layers: ectoderm and endoderm, with no true mesoderm.
- **Conclusion**: This pairing is incorrectly matched.

### Final Answer:
The only correctly matched option is **Radial Symmetry to Cnidarians**.

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