}else if( !(question.equals("a") || question.equals("b")) {
System.out.println("Sorry that isn't an A or a B");
You can't do NOT equals a OR b
You have to do NOT(equals a OR equals b)
Secondly, you are comparing strings with !=, but you should be comparing strings using the .equals(String) method. This has been said millions of times, but: == and != are comparing object references, whereas .equals(String) is comparing String values.
