Article 52 of the Measures for the Supervision and Administration of Futures Companies stipulates that persons who cannot engage in futures trading include the China Securities Regulatory Commission and its dispatched offices, futures exchanges, futures margin security depository monitoring institutions, staff of China Futures Association and their spouses; It is forbidden to enter the securities and futures markets; Units and individuals that fail to provide proof of account opening; Other units and individuals not allowed to engage in futures trading as stipulated by the China Securities Regulatory Commission. So the answer to this question is ABC.