. Red data book contains data of
A: all plant species
B: all animal species
C: economically important species
D: threatened species
- The Red Data Book is a form of public document that is used to record uncommon and endangered species, such as animals, plants, and fungus, as well as some local subspecies, that are found within a state's or country's region.
- The complete list of threatened species can be found in the Red Data Book.
Hence, the correct answer is option D, i.e., threatened species.