the staff / help / me / send the money / very helpful and courteous

• A. 
  The staff helped me to send the money were very helpful and courteous.
• B. 
  The staff that helped me to send the money which were very helpful and courteous.
• C. 
  The staff whom helped me to send the money they were very helpful and courteous.
• D. 
  The staff that helped me to send the money were very helpful and courteous.