Article 10 of the Trading Rules of China Financial Futures Exchange stipulates that the last trading day of the Shanghai and Shenzhen 300 stock index futures contracts is the third Friday of the contract expiration month, and the last trading day is the delivery date. If the last trading day is a national legal holiday or it is not traded due to abnormal circumstances, the following trading day shall be the last trading day and delivery date. So, the topic is C.