Answer:
b. coal
Explanation:
Coal is not a renewable energy source. It is called a non-renewable energy source.
This is because with continual usually, coal reserve is depleted.
Renewable energy source is one in which can replenished within the shortest period of time.
Non-renewable energy source takes a very extensive time for them to form.
Usually thousands to million of years.
One of such example of non-renewable energy is coal and other fossil fuels.
