I place this class of Milking Shorthorn cows C D B A. C puts it all together. She is deeper in the heart and more open in her fore and rear rib than D. In addition, C has that nice snug fore udder and has more levelness to the udder floor, noting the reverse tilt on D. C has the advantage in size and shape of teat and has stronger pasterns. I do grant D for being wider at the top of the rear udder.
D goes over B with her overall depth of fore and rear rib. She also has more cleanness in her hooks and pins and throughout her head and neck. D does show more definition in her median suspensory ligament and is cleaner in the hock than B. I do grant B has more strength throughout.
B logically places over A for her height and width of rear udder. She also has the advantage of a longer fore udder attachment. I will grant A for being stronger in her pasterns than B, but A lacks the dairyness throughout and quality of udder to place any higher.