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At the end of 1997 several nations stated that their oil reserves had not ... ...

At the end of 1997 several nations stated that their oil reserves had not changed since the end of 1996. But oil reserves gradually drop as old oil fields are drained and rise suddenly as new oil fields are discovered. Therefore, oil reserves are unlikely to remain unchanged from one year to the next. So most of the nations stating that their oil reserves were unchanged are probably incorrect.

Which one of the following is an assumption the argument requires?

(A) For any nation with oil reserves, it is more likely that the nation was mistaken in its statements about changes in its oil reserves than that the nation’s oil reserves remained unchanged.  
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT71 (Dec 2013): Logical Reasoning A

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