Which Script Block Will Display Hello World in the Browser

Which script block will display Hello World in the browser when the script is run?

A) <script type="text/javascript"> var message = "Hello "; var message2 = "World"; document.write(message + message2) ; </script>
B) document.write(message & message2) ;
C) var message =  Hello ; var message2 = World ;
D) document.write("message + message2 ") ;