When the following molecule is reacted with one equivalent of HBr, only one double bond reacts to form the product despite having two carbon–carbon double bonds. Explain why.

• A. The second double bond cannot attack the electrophile because it is sterically hindered.
• B. The second double bond cannot attack the electrophile because it is inside the ring.
• C. The second double bond cannot attack the electrophile because it is in resonance with the carbonyl.
• D. The second double bond will not react since it will generate a less stable carbocation.

Answer: (C)