Marking to market is the daily process of settling gains and losses on futures contracts. This process involves adjusting the margin account to reflect the daily fluctuations in the value of the futures contracts. The margin account is a type of collateral that is used to cover potential losses on futures contracts. When the value of the futures contracts changes due to changes in the prices of the underlying assets, the margin account is adjusted accordingly. This process ensures that the margin account always reflects the current value of the futures contracts, thereby protecting both the buyer and the seller from potential losses. Marking to market is a critical aspect of risk management in futures trading.\n\nChoice B is incorrect. Value adjusting is not a term used in futures trading to describe the daily adjustment process of margin accounts. It may be confused with 'marking to market', but it does not accurately represent the procedure of adjusting for gains and losses due to fluctuations in contract values.\n\nChoice C is incorrect. Clearing refers to the process of settling trades, which includes transferring funds from buyer's account to seller's account and vice versa, but it does not specifically refer to the daily adjustment of margins based on contract value fluctuations.\n\nChoice D is incorrect. Initial margining refers to the initial deposit required by a broker when a futures contract is first entered into. This term does not describe the daily adjustment process that accounts for gains and losses due to changes in futures contracts' values.