Match the columns
`{:(Column I,ColumnII),(a."Pseudopodia",p."Mollusca"),(b."Parapodia",q."Chondrichthyes"),(c."Muscular Foot",r."Protozoa"),(d."Fins",s."Annelids"):}`

Options

A. `a-p, b-r, c-s, d-q`
B. `a-r, b-s, c-p, d-q`
C. `a-r, b-p, c-s, d-p`
D. `a-s, b-r, c-q, d-p`

Answer

To solve the matching question, we will analyze each structure in Column I and find the corresponding organism in Column II.

### Step-by-Step Solution:

1. **Match Pseudopodia (a)**:
- Pseudopodia are also known as "false feet" and are primarily found in protozoans, such as amoeba. They assist in locomotion and the engulfment of food particles.
- **Match**: a - r (Pseudopodia - Protozoa)

2. **Match Parapodia (b)**:
- Parapodia are locomotory structures found in annelids. They help in movement.
- **Match**: b - s (Parapodia - Annelids)

3. **Match Muscular Foot (c)**:
- The muscular foot is a structure found in molluscs. It aids in anchorage and locomotion.
- **Match**: c - p (Muscular Foot - Mollusca)

4. **Match Fins (d)**:
- Fins are structures present in fishes, specifically in the class Chondrichthyes (cartilaginous fishes). They are essential for swimming.
- **Match**: d - q (Fins - Chondrichthyes)

### Final Matches:
- a - r (Pseudopodia - Protozoa)
- b - s (Parapodia - Annelids)
- c - p (Muscular Foot - Mollusca)
- d - q (Fins - Chondrichthyes)

### Summary of Matches:
- A → R
- B → S
- C → P
- D → Q

The correct option for this question is **option B: A-R, B-S, C-P, D-Q**.