The mustard mustard everywhere is playing an increasingly important role in the Chinese economic stage. From 2007 to 2011, the market share of Fuling mustard in South China fell from 49% all the way to 30%, corresponding to the Pearl River Delta. The transfer of regional labor-intensive enterprises; in 2012, the number of migrant workers working in the central and western regions increased rapidly, meanwhile, the sales of Fuling mustard in the region created a growth of nearly 50%. Some experts pointed out that the sales of mustard There is a huge correlation with the migration trend of migrant workers, and the government can formulate policies in advance according to the changes in the "press mustard index" to calmly deal with public service issues such as employment, law and order, education, social security, and other issues brought about by the sudden population increase. Which of the following, if true, would best support the remarks of these experts? ['Mustard is a favorite food of the people, Sichuan and Chongqing people love mustard, and Sichuan and Chongqing are both export places of migrant workers.', 'Mustard is delicious and inexpensive, and it is easy to buy and carry. Migrant workers who work outside are the main consumer of mustard.', 'It is rumored that an authoritative department of the country divided the country into "population inflow areas" and "population outflows" according to the changes in the "press mustard index", but the department has recently explicitly denied this rumor.', 'The production of mustard in Zhejiang, Fujian and other places may be similar to the sales of Fuling mustard, and the regional changes in its sales can also reflect the migration trend of migrant workers.']