What does a lack of corraboration indicates? a. the author isn't considered to be an expert in his field. b. supporting documents are difficult to find. c. the subject is complex and difficult to understand. d. no other sources present the same information or point of view.

I think the word should be "collaboration" instead of corraboration. So the correct answer would be D. No other sources present the same information or point of view. A lack of collaboration just means that there are no other documents that present that same information. I hope this answer helped you. 

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