mvictor wrote:
I do not agree with the above comment.
the conclusion is : Quantity of cooper cannot be estimated.
B doesn't say that it cannot be made
if something is expensive, that does not mean it cannot be still made, while E clearly says that the Q can be estimated.
E is obviously incorrect. The conclusion is about "coppers cannot be calculated...", or the source of the copper. E only talks about copper in known deposits, not unknown. E tells that a method to estimate is accuracy, this has nothing
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