I prefer B because the bottom part of the grey panel goes on one clean line instead of sudden sharp bump.
A, but put the license plate on the bumper, so it doesnt have the weird bump where the plate would go.
A, but probably with a smaller plate. Looks cleaner And maybe keep the black accent a single size and not make it bump downward just for the plate, maybe keep it the same width and have the plate just sit over it. Plus, A matches the lights.
man, i like the current version a little more, or if you really do wanna change it i think A would look better, B looks very odd