The statements are given below suits for,
1 . Possess a protective shell or exoskeleton
2. Small-sized
3. Ability to fly
4. produce large numbers of offsprings quickly .

Options

A. birds
B. insects
C. mammals
D. reptiles

Answer

To solve the question, we need to analyze each statement and determine which group of organisms they best describe.

### Step-by-Step Solution:

1. **Analyze Statement 1: Possess a protective shell or exoskeleton**
- Organisms with a protective shell or exoskeleton include arthropods (like insects and crustaceans) and mollusks (like snails). Birds, mammals, and reptiles do not possess an exoskeleton.

2. **Analyze Statement 2: Small-sized**
- Many insects are small-sized, while birds, mammals, and reptiles can vary greatly in size, often being larger than insects.

3. **Analyze Statement 3: Ability to fly**
- Insects (like bees and butterflies) have the ability to fly. Birds also fly, but they do not fit the small-sized criterion as strictly as insects do.

4. **Analyze Statement 4: Produce large numbers of offspring quickly**
- Insects are known for their high reproductive rates, often producing large numbers of offspring in a short period. Other groups, like mammals and reptiles, typically have fewer offspring.

5. **Conclusion:**
- Based on the analysis, the statements collectively suit **insects** best. They possess a protective exoskeleton, are generally small-sized, have the ability to fly, and can produce large numbers of offspring quickly.

### Final Answer:
The statements suit **insects**.