Somewhere more than 5,000 years ago was the Dawenkou culture, but it was replaced by Longshan culture about 4400 years ago. What caused the change of these two cultures? Archeologists found that a serious "cold event" occurred about 4400 years ago, the environment changed from the original warm and humid to the cold and dry, the vegetation was greatly reduced, the algae and aquatic plants were almost extinct, Dawenkou culture Migration to the south, and Longshan culture from here to the north, they believe that extreme climate change around 4400 years ago may be the main reason for this cultural change. Which of the above, if true, would best support the above argument? ['Dawenkou culture has a tradition of continuous migration to the south.', 'When the Longshan culture first moved, the population was large, but it gradually decreased and disappeared about 4000 years ago.', 'The ethnic group of Dawenkou culture uses algae and aquatic plants as the main source of food.', 'Ethnic groups in different ways of living have relatively stable demands on climate and environment.']