Answered

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the lack of corroboration indicates that
A no other source present the same information or point of view
B supporting documents are difficult to find
C the subject is complex and difficult to understand
D the author isn't considered to be and expert in his field

Sagot :

Corroboration means that there are other sources of information that support this one.  Therefore A is the correct answer.

Corroboration is the evidence that is backed up by the initial evidence. For example, a witness says that I saw a man in black coat entering the store and buying a bag. Later, the saleswoman, who is another witness testifies that she sold the bag to the man in a black coat. In this case, both witnesses confirm the situation and the evidences coincide. When there is no corroboration, there is not any available source to confirm the same information.