Which of the following may pose a problem for objectivity?
A. A study conducted by an airline company on the relative safety of air travel compared to boat travel.
B. A peer-reviewed journal article on the impact of social media on high-school behaviour.
C. A journal article on the health impacts of a particular fast-food burger that was sponsored by the fast-food chain which makes it.
D. A journal article on the health impacts of a particular fast-food burger that was sponsored by the World Health Organisation.
