challenge: When did Roberto Huerta serve as de facto Federal Interventor of Córdoba, Argentina?
  
  A. January 1, 1971 - December 31, 1971
  B. July 5, 1969 - April 9, 1970
  C. January 1, 1968 - December 31, 1968
  D. July 5, 1972 - April 9, 1973
  Answer: 