The Reliability of the Content in Wikipedia, the Online Encyclopedia

The reliability of the content in Wikipedia, the online encyclopedia, is questionable because

A) All of the administrators are volunteers.
B) No author has to identify himself or herself.
C) The content is updated all the time.
D) It is difficult to test the authenticity of the content due to the fact that anyone can contribute content.
E) All of these are reasons why the content is questionable.