Question

which statement describes a disadvantage of nonrenewable resources?
it is hard to collect large quantities of them at a time.
they are inconsistent or unreliable as an energy source.
they are expensive to collect and transform into energy.
it is difficult to change the habit of using the resource.

Explanation:

Non - renewable resources like fossil fuels (coal, oil, natural gas) require complex and costly processes for collection (e.g., drilling for oil, mining for coal) and transformation into usable energy (e.g., refining oil, burning coal in power plants).
Renewable resources (e.g., solar, wind) can often be harnessed in large quantities (solar farms, wind farms). Non - renewable resources are actually quite consistent as an energy source (e.g., a coal - fired power plant can produce a relatively steady amount of electricity as long as there is coal). And the difficulty in changing the habit of using a resource is more of a social or economic inertia factor rather than a direct disadvantage of the non - renewable resource itself.

Answer:

They are expensive to collect and transform into energy.