有以下程序#include <stdio.h>Void WriteStr(char *fn,char *str){ FILE *fp;Fp=fopen(fn,"w");Fputs(str,fp);Fclose(fp);}Main(){WriteStr("t1.dat","start");WriteStr("t1.dat","end");}程序运行后,文件t1.dat中的内容是______。
A.start
B.end
C.startend
D.endrt
正确答案是B