W: The northeast is experiencing a really terrible winter. Fuel supplies are running low and a lot of people can’t even keep their houses adequately heated. M: I guess that’s why fuel prices have gone up across the nation. Q: What is the problem?（）
A．Fuel cannot be transported to the northeastern states. B．There are too few houses in the northeast. C．People in the northeast are inexperienced in dealing with snow. D．Cold weather in the northeast has increased the demand for fuel.