Select the correct option.
Cause (s) of species extinction is/are :
a. Introduction of exotic species
b. Habitat destruction
c. Overexploitation

Options

A. Options a and b only
B. Options a and c only
C. Options b and c only
D. All the 3 options

Answer

To solve the question regarding the causes of species extinction, we will analyze each option provided and determine whether they contribute to the extinction of species.

### Step-by-Step Solution:

1. **Understanding Species Extinction**:
- Species extinction occurs when a species no longer has any living members. This can happen due to various environmental and anthropogenic factors.

2. **Analyzing Option A: Introduction of Exotic Species**:
- Exotic species, also known as non-native species, are introduced into a new habitat where they can compete with native species for resources. This competition can lead to the decline or extinction of native species.
- **Conclusion**: This is a cause of species extinction.

3. **Analyzing Option B: Habitat Destruction**:
- Habitat destruction refers to the process where natural habitats are altered or destroyed, leading to the displacement or death of the organisms that live there. This is one of the leading causes of biodiversity loss and species extinction.
- **Conclusion**: This is a cause of species extinction.

4. **Analyzing Option C: Overexploitation**:
- Overexploitation occurs when species are harvested at rates faster than they can replenish. This includes overfishing, hunting, and excessive logging, which can lead to population declines and eventual extinction.
- **Conclusion**: This is a cause of species extinction.

5. **Final Conclusion**:
- Since all three options (A, B, and C) are valid causes of species extinction, the correct answer is that all three options contribute to the extinction of species.

### Final Answer:
- The correct option is: **All the three options (A, B, and C)**.