D. Futures trading analysis, based on the margin system, the debt-free settlement system is implemented on the same day, and settlement is carried out every day, so the credit risk is small. It takes a long time for a forward transaction to be completed and finally delivered in kind, during which various changes will occur in the market and various behaviors that are not conducive to performance may occur. All these will make the forward transaction unable to be finally completed, and the forward contract is not easy to transfer, so the forward transaction has high credit risk.