The main body parts common to all molluscs are the -

Options

A. Foot, Radula and the Mantle
B. Foot, Visceral mass (hump) and mantle
C. Visceral mass, Mantle, shell
D. Foot, Radula, Visceral mass

Answer

To answer the question about the main body parts common to all molluscs, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Phylum Mollusca**:
- Molluscs belong to the phylum Mollusca, which includes a diverse group of animals known for their soft bodies and unsegmented structure. They are primarily found in aquatic or damp habitats.

2. **Identify Common Characteristics**:
- Molluscs typically possess a soft body that is often protected by a hard external shell made of calcium carbonate.

3. **List the Main Body Parts**:
- The four main body parts that are common to all molluscs are:
- **Foot**: A muscular structure used for locomotion.
- **Mantle**: A significant part of the anatomy that covers the visceral mass and secretes the shell.
- **Visceral Mass**: The central part of the mollusc that contains most of the internal organs.
- **Shell**: While not all molluscs have a shell (e.g., octopuses), it is a common feature among many molluscs.

4. **Evaluate the Options**:
- Now, let's analyze the provided options:
- **Option A**: Foot, radula, and mantle - Incorrect because while the foot and mantle are common, the radula is not present in all molluscs.
- **Option B**: Foot, visceral mass, and mantle - Correct as all three are indeed common to all molluscs.
- **Option C**: Visceral mass, mantle, and shell - Incorrect as the shell is not present in all molluscs.
- **Option D**: Foot, radula, and visceral mass - Incorrect because the radula is not universal among all molluscs.

5. **Conclusion**:
- The correct answer is **Option B: Foot, visceral mass, and mantle**.