单选题：在水利水电工程注册建造师执业工程规模标准中，农村饮水工程的执业工程规模标准根据其（　　）确定。

题目内容：

在水利水电工程注册建造师执业工程规模标准中，农村饮水工程的执业工程规模标准根据其（　　）确定。 A．等别
B．级别
C．投资额
D．供水人口数量

参考答案：

答案解析：

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