Given that the total number of atoms on our planet remains fairly constant, how is it ever possible to deplete a natural resource such as a metal?
A) The problem remains that not everyone recycles as they should.
B) Recycling only forestalls the inevitable depletion of metal resources.
C) The atoms don't leave our planet, which is why naturally occurring materials never really reach the point of depletion.
D) The problem is with the expense of collecting metal atoms that are uniformly dispersed.
Answer: D
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