The worst has to be B, lose because of a blunder. If my opponent plays brilliantly, then that's fine, congratulations to him. If I give the game away by a stupid oversight, then that's no one's fault but my own, and much harder to swallow.
SURVEY:What do you think is the most frustrating result of a chess game?

B, A, D, E, C.
I agree with Eric, it is always worse to make a blunder than to play someone better than yourself and always worse to lose than draw.
If you are playing someone better than yourself then take your defeat in good grace and treat it as a chance to improve your game.
A loss because of carelessness not necessarily a blunder, though often one. Sometimes I just move too quickly, not giving the position most thought, and it bites me in the ass.

An unexpected king hunt is also very frustating. Like in the Lasker vs. Thompson(or is it Thomas?) game, with the dutch system. I always feel so hopeless and powerless with my king being forced across the board to an inevitable death. So, I guess either E in that case, or B generally.
My own ranking is also B,A,D,E,C.
Some of my friends rank E at the bottom. They think case E usually means you are playing with a rival much stronger than you.

Absolutely B. I just did it Saturday. Last round, chance for 1st place, up a pawn, better position, initiative, dropped rook for knight. I couldn't even hold out for the draw. I'm still kicking myself.

B then A, the others not at all. I would even go as far as to say that I have some losses that were more enjoyable games than some of the wins!

"B" is my answer. But there is another result I find frustrating. It is when it has been a tight game and then my opponent makes a blunder. Sure, I'm glad to have a win, but it's not nearly as satisfying. It's more frustrating (for me) than C, D or E.
E, B, A, D, C
But at the same time E can be the "most useful" thing, because you learn after you analyze the game that went one way. Was it a bad choice of opening, bad moves or you didn't plan well your time and got into time trouble? You understand it, you play better next time. C,D can be useful, you can use the same stuff like some sacrifice against somebody else. Blunders don't teach you anything, just to be careful next time.

Either B or A, blunder's make me crazy, whether they lead to a loss or a draw. For the other three, I will never be upset that my opponent played well, as that can only lead to my improvement after post-game analysis.
I had a talk with several friends today about different kinds of frustrating games we had experienced. We wonder how others feel about different kinds of frustrating results. Which of the following do you think might make you feel worse? Please rank them from most frustrating to the least:
A、Forced to a draw game because of blunder;
B、Lose because of blunder;
C、Forced to a draw game because of impressive moves by your rival;
D、Lose becaus of impressive moves by your rival;
E、Lose a game that is dominated by your rival.