Final answer:
The key feature of Wikipedia's approach to maintaining accuracy and unbiased information is Open editing and collaboration.
Step-by-step explanation:
The key feature of Wikipedia's approach to maintaining accuracy and unbiased information is D) Open editing and collaboration.
Wikipedia allows anyone to create and edit articles, which means that a large number of experts and enthusiasts contribute to its content. This open editing system allows for a diverse range of perspectives and knowledge to be included in the articles. While this approach may lead to occasional contentious debates and the need for ongoing revision, it is also what makes Wikipedia a dynamic and continually evolving source of information.