At today's rate of consumption, the world's known reserves of tantalum will last about ________ more years at today's rate of consumption, but if everyone in the world began consuming tantalum at the rate of U.S. citizens, then it would last for only
________ years.
A) 377; 5 B) 129; 31 C) 314; 159 D) 2016; 131 E) 56; 7
Answer: B
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