**Red Data Book and Animals on the Verge of Extinction**

The correct answer is option A, which states that the Red Data Book deals with animals on the verge of extinction. The Red Data Book is a comprehensive record that lists and provides information on various endangered and threatened species. It serves as an essential tool for conservationists, researchers, and policymakers to identify and prioritize the conservation efforts needed to protect these vulnerable species. Here is a detailed explanation of why the Red Data Book primarily focuses on animals on the verge of extinction:

**1. Red Data Book:**
The Red Data Book is an international initiative that aims to document and assess the conservation status of various species. It was first published by the International Union for Conservation of Nature (IUCN) in 1964 and has since become a vital resource for conservation efforts worldwide. The book categorizes species into different categories based on their conservation status, such as critically endangered, endangered, vulnerable, etc.

**2. Conservation Status:**
The Red Data Book primarily focuses on animals on the verge of extinction because its main purpose is to highlight and raise awareness about the species that are at the highest risk of disappearing from the planet. These species face severe threats, including habitat loss, pollution, climate change, poaching, and illegal wildlife trade, among others. By identifying and documenting these species, the Red Data Book provides a scientific basis for conservation actions and helps prioritize efforts to protect them.

**3. Role in Conservation:**
The Red Data Book plays a crucial role in conservation by providing a comprehensive database of endangered and threatened species. It serves as a guide for conservationists, researchers, and policymakers to develop and implement effective conservation strategies. The book's information helps identify key habitats that need protection, establish protected areas, and implement measures to mitigate threats to these species' survival.

**4. Monitoring and Assessment:**
The Red Data Book is periodically updated to reflect the changing conservation status of species. It helps in monitoring population trends, identifying new threats, and assessing the effectiveness of conservation measures. By regularly updating the book, scientists can track the progress of conservation efforts and make informed decisions to address emerging challenges.

**Conclusion:**
The Red Data Book primarily focuses on animals on the verge of extinction because its main objective is to highlight and prioritize species that are at the highest risk of disappearing. By providing comprehensive information on these species, the Red Data Book plays a crucial role in guiding conservation efforts and raising awareness about the urgent need to protect biodiversity.