My reasoning:
B, and F would have the sharpest, followed by C and possiblely A.
Like others said, C, D, & E should have close pattern, but C would be sharper and different refresh rate.
Again, G and H should be close.
S-video should be better then composite for same monitor + video card combo. So G better than H but close pattern,
D better than E but close pattern, pattern also simular to C.
1, 5, & 6 are the sharpest images.
To me, 4 & 7 are very close in size and pattern, 7 much better than 4 (thus 4 composite).
To me, 3 & 6 are close if you acount for different refresh rate. 2 has nearly the same pattern, but a way different size. I assumed oscar moved the camera for the NEC monitor.

2 has more bleed/blend than 3. (thus 2 is composite and 6 is vga/BNC)
That leaves 5 and 1.
5 is sharper than 1, and viewsonic has a good rep for sharp images.
1 is sharp, but is softer than 5. So 1 gets the XGA.
I'm probably wrong about the NEC monitor, thus messing up 3 other answers, but hey, might as well guess.

Good luck everyone!