C is correct answer
The code should be this:
try{
List<String> nameList;
Account a;
String s = a.Name;
nameList.add(s);
}
catch(ListException le)
{
System.debug('List Exception');
}
catch( NullpointerException npe )
{
System.debug('Nullpointer Exception');
}
catch( Exception e )
{
System.debug ('Generic Exception') ;
}
}
Try it in anonymous window

This is a syntax error so i think the only right answer is A. No message i going to be logged as the syntax error will show up

This code can't be saved even
I tried to execute the code above on the anonym block and it gives me this error :
Line: 2, Column: 1
Unexpected token 'List'.

The List expects a type ( String , Integer ... )