A, bus conductor killed a passenger. Is the operator civilly liable?

• A. Yes, based on contract, but with defense of the diligence of a good father of a family;
• B. Yes, based on quasi-delict;
• C. Yes, based on breach of contract of carriage, but cannot interpose the defense of due diligenc;
• D. Yes, but subsidiary in case of insolvency of the driver.