What Is Incorrect in the Following Code Snippet

What is incorrect in the following code snippet?
Public static void displayBox(String str)
{
System.out.println("--------") ;
System.out.println(str) ;
System.out.println("--------") ;
}
Public static void main(String[] args)
{
System.out.println(displayBox("Hello World") ) ;
}

A) displayBox is called with incorrect arguments.
B) displayBox should be called in an assignment statement.
C) The return value from displayBox is never used.
D) displayBox does not return a value; therefore, it cannot be used with System.out.println