Octopus, Squid and Cuttle Fish belong to class.

Options

A. Cephalopoda
B. Apoda
C. Decapoda
D. Scaphopoda.

Answer

**Step-by-Step Solution:**

1. **Identify the Organisms**: The question mentions three organisms: octopus, squid, and cuttlefish.

2. **Determine Their Classification**: All three organisms belong to the phylum Mollusca.

3. **Classify the Organisms**: Within the phylum Mollusca, octopus, squid, and cuttlefish are classified under the class Cephalopoda.

4. **Understand Characteristics**: The class Cephalopoda is characterized by being exclusively marine and includes some of the most developed non-caudates.

5. **Select the Correct Option**: Based on the classification, the correct answer to the question is option A: Cephalopoda.

**Final Answer**: Octopus, squid, and cuttlefish belong to the class Cephalopoda.

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