Pick up the properly matched

Options

A. Arthropoda-Arachnida-Lobster
B. Arthropoda-Myriapoda-Scorpion
C. Mollusca-Cephalopoda-Octopus
D. Mollusca-Gastropoda-Squid.

Answer

To solve the question of identifying the properly matched phylum, class, and organism, we can follow these steps:

### Step 1: Analyze the First Option
- **Phylum:** Arthropoda
- **Class:** Arachnida
- **Organism:** Lobster

**Analysis:**
- Lobsters belong to the class Crustacea, not Arachnida.
- Arachnida includes spiders and scorpions.

**Conclusion:** This is an incorrect match.

### Step 2: Analyze the Second Option
- **Phylum:** Arthropoda
- **Class:** Myriopoda
- **Organism:** Scorpion

**Analysis:**
- Scorpions belong to the class Arachnida, not Myriopoda.
- Myriopoda includes organisms like centipedes and millipedes.

**Conclusion:** This is also an incorrect match.

### Step 3: Analyze the Third Option
- **Phylum:** Mollusca
- **Class:** Cephalopoda
- **Organism:** Octopus

**Analysis:**
- Octopus is indeed a member of the class Cephalopoda, which falls under the phylum Mollusca.

**Conclusion:** This is a correct match.

### Step 4: Analyze the Fourth Option
- **Phylum:** Mollusca
- **Class:** Gastropoda
- **Organism:** Squid

**Analysis:**
- Squid belongs to the class Cephalopoda, not Gastropoda.
- Gastropoda includes organisms like snails and slugs.

**Conclusion:** This is an incorrect match.

### Final Answer
The only correctly matched option is the third one: **Phylum Mollusca, Class Cephalopoda, Organism Octopus.**