Test analysis: It is necessary for a modern manufacturing enterprise to establish and improve the organizational structure of the enterprise, not only to establish, but also to operate scientifically and reasonably. The organizational structure of modern companies generally consists of three parts: decision-making institutions, executive institutions and supervision institutions. The decision-making body of the company is the general meeting of shareholders and its elected board of directors, and item A meets the meaning of the question; The general manager and his assistant are administrative organizations, and the board of supervisors is the supervisory organization. Each department of item D company is not specific. The correct answer to this question is a.