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．if语句只能嵌套一层
B．if子句和else子句中可以是任意的合法的c语句
C．不能在else子句中再嵌套if语句
D．改变if-else语句的缩进格式，会改变程序的执行流程

参考答案：

答案解析：

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