Answer:
C. The type of source.
Explanation:
In the citation, "World Book Online. 2012. Web. 13 May 2013. <http://www.worldbookonline.com/advanced/article?id=ar574420&st=underground+railroad>." You can find
A. The website URL which is "http://www.".
B. The articles title which is "World Book Online"
C. The type of source which is MLA but it is NOT STATED IN THE CITATION.
D. The production year which is 2012 accessed May 13, 2013.
So the correct answer is C because it is not listed in the citation.
