We will not be ready when fossil fuels run out and, as they disappear, those in poverty will lose access to things like heating and fuel for vehicles is how they will be affected and is denoted as option C.
This is a hydrocarbon which is present naturally in the earth crust and examples include coal, crude oil etc.
When constant extraction is done, they will run out thereby making fuels for vehicles etc scarce and inaccessible.
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