Why is the chemical formula CBr₃ unlikely to be correct?

• A. C in CBr₃ forms three bonds only. C should form four bonds.
• B. C in CBr₃ forms four bonds. C should form three bonds only.
• C. Cl in CBr₃ forms four bonds. Br should form three bonds only.
• D. Cl in CBr₃ forms three bonds only. Br should form four bonds.

Answer: (A)