Since the implementation of the target term responsibility system for the manager's term in the previous year, the company's economic benefits have also increased year by year. It can be seen that only by implementing the target term responsibility system for the manager's term can Company A's economic benefits increase steadily. Which of the following, if true, would most weaken the argument? ["the country's economic development has been rapid in the past two years, and the overall situation of the shipping industry is good.", 'The shipping company B, which has not implemented the term target responsibility system, has steadily increased its economic benefits in the past two years.', 'the first-year company A began to implement employee salary management system reform, which greatly mobilized the enthusiasm of company employees.', 'If shipping company A does not implement the term target responsibility system, the economic benefits of the past two years will grow faster.']