The correct option is D A is false, but R is true
Earth is the treasure of a variety of species and hence it is biodiverse. However, this rich biological wealth is declining and species are driven to extinction due to various reasons. Human activities such as over-exploitation of natural resources, destruction of natural habitats, introduction of alien species, hunting etc., are the major causes for decline in the species population.
The International Union for Conservation of Nature (IUCN) publishes the Red Data Book so as to create awareness about the endangered species. The Red Data Book is a catalogue which provides a record of all endangered plants and animals. It provides information on the population status of various species, i.e., the degree of threat to biodiversity
WWF is the World Wide Fund for Nature, an international organization dedicated for the conservation of the environment.
Therefore, the assertion is false but the reason is true.