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.

### Step-by-Step Solution:

1. **Understanding Species Extinction**:
- Species extinction refers to the process where a species ceases to exist. This can occur due to various environmental and anthropogenic factors.

2. **Analyzing Option A: Introduction of Exotic Species**:
- Exotic species are non-native species that are introduced to a new habitat. When these species are introduced, they can outcompete native species for resources such as food and habitat. This competition can lead to the decline or extinction of native species. Therefore, this option is a valid cause of species extinction.

3. **Analyzing Option B: Habitat Destruction**:
- Habitat destruction refers to the process where natural habitats are altered or destroyed, often due to human activities such as deforestation, urbanization, and industrialization. This destruction leads to loss of shelter and resources for many species, contributing significantly to their extinction. Hence, this option is also a valid cause of species extinction.

4. **Analyzing Option C: Overexploitation**:
- Overexploitation occurs when species are harvested at rates faster than they can replenish. This includes activities such as excessive hunting, fishing, and logging. Overexploitation can lead to population declines and ultimately extinction. Therefore, this option is also a valid cause of species extinction.

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

### Final Answer:
All three options are correct causes of species extinction:
- a. Introduction of exotic species
- b. Habitat destruction
- c. Overexploitation