单选题 The main advantage of a financial market hedge of operating exposure to currency risk is that ____. A、financial market hedges can completely cancel operating exposures to currency risk B、financial market transactions are zero-NPV transactions C、the costs of buying or selling financial instruments are low compared to the costs of investing or disinvesting in real assets D、the uncertain cash flows of operating exposures to currency risk are exactly offset by the uncertain outcomes of a financial market hedge E、none of the above