As per the Red Data Book Black buck is listed under

Options

A. Critically endagered species
B. Endangered species
C. Vulnerable species
D. Extinct in the wild

Answer

To determine the classification of the black buck in the Red Data Book, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Black Buck**: The black buck, also known as the Indian antelope, is a species that inhabits grassy plains and forested areas.

2. **Review the Categories in the Red Data Book**:
- **Critically Endangered Species**: These species have experienced a population decline of 80-90% over the last 10 years, with fewer than 50 individuals remaining.
- **Endangered Species**: These species have seen a population decline of 50-70% in the last 10 years, with fewer than 250 individuals remaining.
- **Vulnerable Species**: These species have experienced a population decline of 30-50% over the last 10 years, primarily due to habitat loss.
- **Extinct in the Wild**: These species are no longer found in their natural habitat but may exist in captivity (e.g., zoos).

3. **Evaluate the Black Buck's Status**: The black buck is not critically endangered, as it does not meet the criteria of having a population decline of 80-90% or having fewer than 50 individuals. It also does not fall under the endangered category, as its population has not declined by 50-70% or dropped below 250 individuals.

4. **Determine the Correct Category**: The black buck is classified as a vulnerable species because its population has declined by 30-50% due to habitat loss.

5. **Conclude the Answer**: According to the Red Data Book, the black buck is listed under the category of vulnerable species.

### Final Answer:
The black buck is listed under **vulnerable species** in the Red Data Book.

---