不是很懂

问题如下：

Question A trader buys a stock at $30 and wants to limit downside risk. Which of the following orders will most likely guarantee that he can sell the stock at $25? (GTC means good till cancelled)

选项：

A.Put option buy market order with a strike price of $25

B.GTC, stop $25, limit $25 sell order

C.GTC, stop $25, market sell order

解释：

A is correct. Option contracts can be viewed as limit orders for which execution is guaranteed at the strike price. Therefore, a put buy order at a strike price of $25 will guarantee selling the stock at $25.

C is incorrect. A “GTC, stop $25, market sell” order becomes a market order when the price drops to or below $25 and is executed at the best price available in the market. Thus, the selling price of $25 is not guaranteed.

B is incorrect. A “GTC, stop $25, limit $25 sell” order limits the lower boundary to $25 but it does not guarantee execution at $25; in a fast-moving market prices may have dropped below the limit and the order will then not be executed.