Whoa easy man!
Your frustration is understandable, however I think all of us in aviation (especially the guys at the controls) have to face similar situations very often... which makes flying that much more interesting and challenging, anyway..
No one seems to be able to point the correct answer because apparently the question is incorrectly framed. A better way may have been keeping the choices as M1 and M>1 (or M1.1). In that case I would go for the latter.
In the meanwhile I have referred to AC Kermode (my best friend) and he says M1.1 for Bow Wave approaching from front.
Hope that helps, cheer up!