Answer: The right answer is the D. All of the above.
Explanation: Just to elaborate a little on the answer it can be added that the site, one of the most visited in the world, is managed by a group of international volunteers and it is easily edited. It is not a .gov site, and, therefore, it is not managed by a government organization that, as it can be expected, guarantees that the information is objective and has been verified. Finally, Wikipedia is often biased and it tends to show a leftist ideology, but those articles that have been constantly reviewed tend to become neutral and impartial. For all these reasons, it is always important to verify the information provided in Wikipedia against, at least, another reliable and widely respected source.
