有以下程序：
#include ＜stdio.h＞
fun(int a, int b)
if(a＞b) return(

A．发现错误
B．改正错误
C．改善软件的性能
D．挖掘软件的潜能

A．typedef struct
int red;
int green;
int blue;
COLOR;
COLOR cl;
B．struct color cl
int red;
int green;
int blue;

C．struct color
int red;
int green;
int blue;
cl;
D．struct
int red;
int green;
int blue;
cl;