Alex is at the hardware store comparing different types of piping for a repair in his home kitchen. He can choose between copper piping or plastic piping. He knows that copper piping is stronger but more expensive. He also knows that plastic piping will work for the job that he is doing, and it is less expensive Based on the information presented in this scenario, what can you determine about the copper piping?

a. Copper is a resource that is less scarce then plastic.
b. Copper is more freely available than plastic.
c. Copper is a renewable resource.
d. Copper is a scarce resource, which increases its value.