要在D盘MyDir目录下新建一个MyFile.txt文件用于写，正确的语句是（ ）。

A. FILE *fp=fopen("D:\MyDir\MyFile.txt","w");
B. FILE *fp; fp=fopen("D:\\MyDir\\MyFile.txt","w");
C. FILE *fp; fp=fopen("D:\MyDir\MyFile.txt","r");
D. FILE *fp; fp=fopen("D:\\MyDir\\MyFile.txt","r");