GMAT Critical Reasoning (CR) | Re: Early pencil leads were made of solid graphite minted in Cumberland,

Option B is correct?
What's official answer?
A. Incorrect. We can't infer whether it's only deposit of graphite.
B. Correct answer
C. War did not happen because of graphite
D . Frequently gives rise to inventions? We cannot infer if inventions are happening frequently.
E. Out of scope

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