Match and find the correct combination
`{:((a)"Ostracodermi",(i)"Lobe-finned fishes"),((b)"Coelacanth",(ii)"Exocoetus"),((c)"Cyclostomes",(iii)"Extinct jawless fishes"),((d)"Osteichthyes",(iv)"Hagfish"):}`

Options

A. `(a)-(iii),(b)-(i),(c)-(iv),(d)-(ii)`
B. `(a)-(ii),(b)-(iii),(c)-(i),(d)-(iv)`
C. `(a)-(i),(b)-(iii),(c)-(ii),(d)-(iv)`
D. `(a)-(iii),(b)-(ii),(c)-(iv),(d)-(i)`

Answer

To solve the matching question, we need to correctly pair each group of organisms with their corresponding descriptions. Let's break it down step by step:

### Step-by-Step Solution:

1. **Identify the Groups:**
- (a) Ostracodermi
- (b) Coelacanth
- (c) Cyclostomes
- (d) Osteichthyes

2. **Identify the Descriptions:**
- (i) Lobe-finned fishes
- (ii) Exocoetus
- (iii) Extinct jawless fishes
- (iv) Hagfish

3. **Match Each Group with the Correct Description:**
- **Ostracodermi (a):** These are known as extinct jawless fishes from the Paleozoic era. Therefore, the correct match is (iii) Extinct jawless fishes.
- **Coelacanth (b):** Coelacanths are a group of lobe-finned fishes. Thus, the correct match is (i) Lobe-finned fishes.
- **Cyclostomes (c):** Cyclostomes are living jawless fishes, which include hagfish and lampreys. Hence, the correct match is (iv) Hagfish.
- **Osteichthyes (d):** This group refers to bony fishes, which includes species like Exocoetus (flying fish). Therefore, the correct match is (ii) Exocoetus.

4. **Summarize the Matches:**
- (a) Ostracodermi → (iii) Extinct jawless fishes
- (b) Coelacanth → (i) Lobe-finned fishes
- (c) Cyclostomes → (iv) Hagfish
- (d) Osteichthyes → (ii) Exocoetus

### Final Combination:
- A → iii
- B → i
- C → iv
- D → ii

### Correct Option:
The correct combination is:
- A (Ostracodermi) → 3 (Extinct jawless fishes)
- B (Coelacanth) → 1 (Lobe-finned fishes)
- C (Cyclostomes) → 4 (Hagfish)
- D (Osteichthyes) → 2 (Exocoetus)

Thus, the correct answer is:
**A - 3, B - 1, C - 4, D - 2.**