Asiatic tigers are considered an endangered species. The tiger population is rapidly declining across Asia due to poaching and habitat loss. Which type of investigation would provide the most accurate data on the tiger population?

A. systematic observation of Asiatic tigers that counts the number of tigers observed
B. a field study that observes asiatic tigers in their natural habitat
C. a comparison of asiatic tigers to the bengal tigers
D. a model representation of the asiatic tiger range