问题详情

What is the main idea of the passage？
A) American firms are different from Japanese and German firms in human-resource management.
B) Extensive retraining is indispensable to effective human-resource management.
C) The head of human-resource management must be in the central position in a firm’s hierarchy.
D) The human-resource management strategies of American firms affect their competitive capacity.请帮忙给出正确答案和分析，谢谢！