Which of the following molecules is the best Lewis structure a resonance structure?

• A. NO₂⁺ (N = central atom)
• B. SO₂ (S = central atom)
• C. HCN (C = central atom)
• D. BrO₃^– (Br = central atom)
• E. COH₂ (C = cental atom)

Answer: (D)