B如何解释？C为何不对？

问题如下：

Which of the following factors determines the optimal execution approach?

选项：

Speed of execution

Urgency of an order

Financial stability

解释：

B is correct. A list of criteria used in determining the optimal order execution approach, including urgency of an order, characteristics of the securities traded, characteristics of the execution venues used, investment strategy objectives and rationale for a trade.