Answer:
the correct answer is "a. renewable; nonrenewable"
Explanation:
This one is straightforward.
A renewable resource is a natural resource which will replenish to replace the portion depleted by usage and consumption while a non-renewable resource will not replenish to replace the portion depleted by usage and consumption.
Examples of renewable resources are; solar, wind, geothermal energy, hydro-power, biomass.
Examples of non-reneable resources are; propane gas, crude oil, natural gas, coal, uranium.