LSAT－13－4－8

8.(D)     A history book written hundreds of years ago contains several inconsistencies. Some scholars argue that because the book contains inconsistencies, the author must have been getting information from more than one source.

The conclusion cited does not follow unless

(A) authors generally try to reconcile discrepancies between sources

(B) the inconsistencies would be apparent to the average reader of the history book at the present time

(C) the history book’s author used no source that contained inconsistencies repeated in the history book

(D) the author of the history book was aware of the kinds of inconsistencies that can arise when multiple sources are consulted（C）

(E) the author of the history book was familiar with all of the available source material that was relevant to the history book

I can’t get the meaning of C.

History book contains inconsistencies------the author get information from more than one source

But C sounds like the opposite to the conclusion

c eliminates another explanation, that is, the inconsistence resulted from the author of the history book used a souce that contains incosistence.

so even if the souce is the only source the author have used, there may be inconsistence exist in his or her history book. That contradict the conclusion cited by these scholors.