以下选项中不能正确把cl定义成结构体变量的是( )。

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;