Which Line Completes This Code Fragment to Define a Text

Which line completes this code fragment to define a text file named txtfile for reading? ____________________________________________________
String line = scan.nextLine() ;

A) Reader scan = new Reader(new File("txtfile") ) ;
B) FileReader scan = new File("txtfile") ;
C) Scanner scan = new Scanner(System.in) ;
D) Scanner scan = new Scanner(new File("txtfile") ) ;