A can be harmful to the environment because it generates an additional demand for oil.
B requires unconventional drilling methods that cause lower impact on the nation's carbon footprint.
C is not feasible since it will require non-conventional financing to make up for the lower output rates.
D produces higher carbon emissions resulting from both the extraction and the deployment of fuel from this source.
E has not been authorized since Canada's governmental authorities have passed strict laws against the exploration of such reserves.