Only when an enterprise has been attracting and training talents can it build a strategic talent echelon, and a strategic talent echelon is necessary for an enterprise to continuously expand its scale. Which of the following conditions, if any, would weaken the above conclusion? ['Company A is constantly expanding its size, but has not been attracting talent.', 'Company B has been training talents and establishing a strategic talent echelon.', 'Company C has established a strategic talent echelon, but has not continued to expand its size.', 'The Ding company has not continuously expanded its scale, but has been attracting and training talents.']