The human factors that cause haze weather in winter in many cities in northern provinces are as follows

Hazy weather is mainly caused by air pollution. The energy consumption of rural residents in Hubei Province is mainly burning straw, which pollutes the urban atmosphere through regional transmission. One of the important pollution sources in cities is automobile exhaust. It is impossible to clear forests and reclaim land in cities. Hubei is not very cold in winter, and air pollution is unlikely to be caused by coal-fired heating.

So choose: C.