The question is incomplete and the full version can be found online.
Answer: B. What factors are reducing giant pandas’ natural habitat?
Explanation:
The question first states that Cameron´s initial research on why giant pandas are endangered found that giant pandas are native to China, they eat mostly bamboo, they have a reproductive rate of one cub in two years, their natural habitat has shrunk to a small area in central China, and around 1,600 to 8,000 are estimated to be alive in the wild.
Considering this first information, out of the questions provided, the best to find possible explanations to why giant pandas are endangered is what factors are reducing giant pandas’ natural habitat.
Option A would be incorrect because knowing how many pandas are there in zoos would not be useful to a study on wildlife. Option C is also incorrect because, although the cause for the lack of an accurate census of how many pandas live in the wild should be studied and solved, is not the objective of this study. And option D is incorrect because knowing other researchers working on finding out more about threats to the great panda could be useful to the study, but not the objective of the study.