Given below are four matchings of an animal and its kind of respiratory organ
(i). Silverfish - Trachea
(ii). Scorpion - Book lung
(iii). Sea squirt - pharyngeal gills
(iv). Dolphin - Gills
The correct matchings are

Options

A. II and IV
B. III and IV
C. I and IV
D. I , II and III

Answer

To solve the question regarding the correct matchings of animals and their respiratory organs, we will evaluate each pairing one by one.

### Step-by-Step Solution:

1. **Evaluate Silverfish - Trachea**:
- Silverfish are insects that possess a tracheal system for respiration. Therefore, this pairing is **correct**.

2. **Evaluate Scorpion - Book lung**:
- Scorpions are arachnids and they utilize book lungs for respiration. Thus, this pairing is also **correct**.

3. **Evaluate Sea Squirt - Pharyngeal gills**:
- Sea squirts, or tunicates, have pharyngeal gills that they use for filter feeding and respiration. This pairing is **correct** as well.

4. **Evaluate Dolphin - Gills**:
- Dolphins are mammals and breathe air using lungs, not gills. Therefore, this pairing is **incorrect**.

### Summary of Findings:
- Correct matchings:
- Silverfish - Trachea (Correct)
- Scorpion - Book lung (Correct)
- Sea squirt - Pharyngeal gills (Correct)
- Dolphin - Gills (Incorrect)

### Conclusion:
The correct matchings are:
- Silverfish - Trachea
- Scorpion - Book lung
- Sea squirt - Pharyngeal gills

Thus, the correct answer is option 4, which states that the first three pairings are correct.