The locomotory organs of Echinodermata are

Options

A. tube feet
B. muscular feet
C. Jointed legs
D. parapodia

Explanation

### Step-by-Step Solution:

1. **Identify the Phylum**: The question asks about the locomotory organs of Echinodermata. Echinodermata is a phylum that includes marine animals such as starfish and sea urchins.

2. **Understand the Characteristics**: Echinoderms are known for their unique body structure, which includes a hard exoskeleton made of calcareous plates and spines.

3. **Locomotion in Echinodermata**: The primary locomotory organs in Echinodermata are tube feet. These tube feet are part of the water vascular system, which helps in movement, feeding, and gas exchange.

4. **Examples of Echinoderms**: Common examples include the starfish (Asteroidea) and sea urchins (Echinoidea). Both of these organisms utilize tube feet for locomotion.

5. **Eliminate Other Options**:
- Muscular feet are found in mollusks, not echinoderms.
- Jointed legs are characteristic of arthropods, such as insects and crustaceans.
- Parapodia are fleshy protrusions used for locomotion in annelids, like earthworms.

6. **Conclusion**: Based on the above information, the correct answer to the question is that the locomotory organs of Echinodermata are tube feet.

### Final Answer:
The locomotory organs of Echinodermata are **tube feet**.

---