为自己加油

以下Java程序代码中，能创建 Bufferedreader对象的是

A.Bufferedreader in=new Bufferedreader(new Filereader(“a .dat” ));
B.Bufferedreader in=new Bufferedreader(new Reader("a. dat"));
C.Bufferedreader in=new Bufferedreader(new Filelnputstream("a. dat"));
D.Bufferedreader in =new Bufferedreader(new Inputstream("a dat"));