题目：
The law of diminishing returns states that for a given production process, as more and more of a resource (such as labor) are added, holding the quantities of other resources fixed:（）
A. cost declines at an increasing rate.
B. cost declines at a decreasing rate.
C. output increases at a decreasing rate.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：交互式数据库系统面向对象数据库系统
