Only when/ general's personal diaries/ publish/ truth/ come out//

• A. 
  Only when the general's personal diaries were published did the truth come out.
• B. 
  Only when the general's personal diaries had been published the truth come out.
• C. 
  Only when the general's personal diaries were published had the truth come out.
• D. 
  Only when the general's personal diaries were published the truth came out.