To me, Design C looks like it's bleeding Classic/X elements together, with the hands and waist. I mean, you could throw that design into Command Mission, no problem, and it wouldn't look the least bit out of place. It loses the "Legends" feel.
I went with A. I like consistency, and I like seeing classic designs brought to life in the hands of both more detailed artists and more powerful hardware, no need to reinvent the wheel. But I must admit, B is pretty darn awesome. I just wish, color-wise, they'd left the thighs/upper-arms gray. Again, that was a fairly unique touch to Trigger's design among the many "Mega Men" we know; no sense in going backwards.
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