单项选择题:
An analyst does research about liquidity. Liquidity in financial markets is best described as the ability to purchase or sell an asset:（）
A. at a low transaction cost.
B. quickly at a known price.
C. quickly and easily at a price close to fair market value.
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答案：C
解析: 流动性是指在金融市场中迅速而便捷地按市场公允价格买卖资产的能力，选项C是符合定义的。