感觉没有很理解

问题如下：

An instruction that indicates when an order may be filled is most likely a(n):

选项：

A.validity instruction. B.clearing instruction. C.execution instruction.

解释：

Solution

1. Correct because validity instructions indicate when the order may be filled.

2. Incorrect because clearing instructions indicate how to arrange the final settlement of the trade, not when the order may be filled.

3. Incorrect because execution instructions indicate how to fill the order, not when the order may be filled.

Market Organization and Structure

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