The species listed in Red Data Book are

Options

A. Threatened
B. Endangered
C. Rare
D. All of these

Answer

**Step-by-Step Solution:**

1. **Understanding the Red Data Book**: The Red Data Book is a comprehensive record maintained by the International Union for Conservation of Nature (IUCN) that documents the conservation status of various species of plants and animals.

2. **Purpose of the Red Data Book**: The primary purpose of the Red Data Book is to assess the risk of extinction faced by different species in their natural habitats. It categorizes species based on the level of threat they are experiencing.

3. **Categories of Species**: The Red Data Book classifies species into several categories based on their conservation status. These categories include:
- **Extinct**: Species that no longer exist anywhere on Earth.
- **Extinct in the Wild**: Species that are no longer found in their natural habitat but may exist in captivity or cultivation.
- **Critically Endangered**: Species facing an extremely high risk of extinction in the wild.
- **Endangered**: Species that are at a high risk of extinction in the wild.
- **Vulnerable**: Species that are at risk but not as critically as the endangered species.

4. **Conclusion**: Given that the Red Data Book includes species that are threatened, endangered, and rare, the correct answer to the question is that the species listed in the Red Data Book are "all of these".

5. **Final Answer**: Therefore, the correct option is "all of these".

---