Which of the following statements best describes the limits of arbitrage in correcting market anomalies（）
A. When fundamentals indicate that a stock is overvalued or undervalued, trading based on this information will be immediately profitable.
B. Arbitrage is not always risk-less as was shown during the internet stock bubble of the 1990s, when traders were short a stock and had to cover their positions at a much higher takeover price.
C. There is no limitation to arbitrage in correcting market anomalies because it is a risk-less trading activity and once there is a mispricing it will be exploited to its fullest.