Copper is a metal that is used for many purposes. It is mined from the earth using various methods. Though the amount of copper
in the Earth's crust is very large, if the mining of copper continues, it will eventually run out. All BUT one method listed below will help conserve the world copper supply. Which method might actually increase copper mining?
A) a plan to collect copper bound for landfills and recycling it instead
B) the development of a cheaper and more efficient way to mine for copper
C) development of a material that could serve as a substitute for copper wiring
D) the use of other metals to replace the copper normally found in electric motors
