Nucleophilic addition can occur at carbon 2 or carbon 4 of the given α,β-unsaturated ketone. Explain why.

• A. A nucleophile can add to either C₂ or C₄ because either C₂ or C₄ has a negative character.
• B. A nucleophile can add to either C₂ or C₄ because either C₂ or C₄ has an electrophilic character.
• C. A nucleophile can add to either C₂ or C₄ because either C₂ or C₄ bears a radical during resonance.
• D. A nucleophile can add to either C₂ or C₄ because either C₂ or C₄ can expand its octet to accommodate another substituent.

Answer: (B)