Given below are four matchings of an animal and its kind of respiratory organ.
`{:("A. Silver fish - Trachea"),("B. Scorpion - Book lung"),("C. Sea squirt - Pharyngeal gill slits"),("D. Dolphin - Skin"):}`
The correct matchings are

Options

A. a) A and B
B. b) A,B and C
C. c) B and D
D. d) C and D

Explanation

To solve the problem of matching animals with their respective respiratory organs, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Identify the Respiratory Organ of Silverfish (A)**:
- The silverfish is known to respire through trachea.
- **Match**: A. Silverfish - Trachea (Correct)

2. **Identify the Respiratory Organ of Scorpion (B)**:
- Scorpions possess book lungs, which are specialized respiratory structures.
- **Match**: B. Scorpion - Book lung (Correct)

3. **Identify the Respiratory Organ of Sea Squirt (C)**:
- Sea squirts have pharyngeal gill slits that are used for respiration.
- **Match**: C. Sea squirt - Pharyngeal gill slits (Correct)

4. **Identify the Respiratory Organ of Dolphin (D)**:
- Dolphins are mammals and they respire through lungs, not skin.
- **Match**: D. Dolphin - Skin (Incorrect)

### Conclusion:
- The correct matchings are:
- A. Silverfish - Trachea (Correct)
- B. Scorpion - Book lung (Correct)
- C. Sea squirt - Pharyngeal gill slits (Correct)
- D. Dolphin - Skin (Incorrect)

### Final Answer:
The correct matchings are A, B, and C.