A: Yellow-2 adjacent to Red-1 ✗. B: Blue-2 adjacent to Green-3 ✓, but Yellow-4 not adjacent to Red-1 ✓ — actually this works. C: Red-6, Yellow-5 adjacent to Red-6 ✗. Let me re-check: C has Yellow-5 next to Red-6 ✗. D: Blue-3 not adjacent to Green-2 ... Green-2 and Blue-3 ARE adjacent ✓. Yellow-5 not adjacent to Red-1 ✓. D works. Actually B: all constraints satisfied. B is valid.
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