In recent years, in order to avoid the occurrence of coal mine safety accidents, many coal mines have increased their emphasis on safety in production. Public information shows that before 2000, the number of deaths in coal mines in China increased by tens of thousands each year. From 2000, the number of accident deaths each year Began to control below 7,000 people, the accident death toll was 6,434 in 2003; 6,027 people were killed in 2004; 5,986 people were killed in 2005; a total of 4,746 fatal accidents occurred in coal mines nationwide in 2006. Therefore we have concluded that as long as coal mines are safe Paying enough attention to production can effectively curb the occurrence of mining accidents. Which of the following would weaken the above conclusion most? ['n recent years, coal mine owners have not really implemented management measures such as the construction of safe production facilities, capital investment, publicity and education.', "n recent years, coal mine safety has caused great attention from relevant departments, and the state's investment in safe production has been increasing.", ' recent years, the country has forcibly closed a large number of illegal small coal mines without security guarantees.', 'n recent years, some coal mines with good geological conditions and high safety have started construction.']