有以下程序

#include <string.h>

main( )

{ char p[20]={ "a", "b", "c", "d"},q[]="abc", r[]="abcde"

strcat(p,r); s trcpy(p+strlen(q),q);

p rintf("%d ", strlen (p));

}

程序运行后的输出结果是

A)9

B)6

C)11

D)7