单选题 In commodity trading, the exchange removes any daily losses from a trader"s account and acids any gains to the trader"s account. This process is known as :

A、 initial margin.
B、 maintenance margin.
C、 marking to market.

【正确答案】 C

【答案解析】To safeguard the clearinghouse, commodity exchanges require traders to settle their accounts on a daily basis. Marking to market is when any loss for the day is deducted from the trader"s account, and any gains are added to the account.