单选题：以下叙述中正确的是( )。

题目内容：

以下叙述中正确的是( )。 A．预处理命令行必须位于c源程序的起始位置
B．在c语言中，预处理命令行都以“#”开头
C．每个c程序必须在开头包含预处理命令行：#include<stdio．h>
D．C语言的预处理不能实现宏定义和条件编译的功能

参考答案：

答案解析：

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