Conservation does not make coal a renewable resource (infinite resource) as there are still limited years before the supply runs out, nor does it make coal a sustainable resource, which is not mentioned in the data. Conservation of coal is not correlated to the growth of the population in this diagram hence the only possible answer is option B. Option B is supported by the data in the diagram as seen by how increased number of conservation tatics increased the years before coal runs out for the average population growth rate.
