A Red Data Book contains lists of species whose continued existence is threatened. Species are classified into different categories of perceived risk. Each Red Data Book usually deals with a specific group of animals or plants (reptiles, insects, mosses). They are now being published in many different countries and provide useful information on the threat status of the species.
The red-listing assessment is a simple logical process to determine the status of the threat to a species based on available information.
Thus, Option "B" is correct.