It's A, and I can say that as professional stereographer. :-)
It's an nice shot. I'm always fascinated by shots of the heavens that manage to include Z depth. Some people have used librations of the moon to create 3D moon shots, which is pretty cool.
A couple of small suggestions - I would put the 'A' label on the same place in both eyes (otherwise it introduces retinal rivalry in that part of the frame).
Also, the format of these images works against you. Stereoscopic images work in a left-right plane. At the edge of the image you often get issues with the stereo window. I'm not sure if you shot the image this way (due to the way the comet was moving at the time) or if you created it from a single image, but you will find you'd get better mileage from formats that are not tall and skinny because your eyes can move more before it hits the edge of the stereo window. Do you have any more image to play with on either side?
Cheers, and well done mate.
Markus
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