> Ahhhhhhhh, yes......of course..... of course!
> And that appropriate letter would OBVIOUSLY be:
(insert clue here).

Finally, I got it right! Yess!

Won't spoil your hunt, though, but I'll give you a hint:
The key words are "For the fifth time, this isn't funny!"
-- and to find out why, you have to dig a bit deeper into
the matter, maybe even take a course!