challenge: When did Chen Bao-ji serve as the Minister of Council of Agriculture?
  
  A. 6 February 2012 - 31 January 2016
  B. 1 January 2010 - 31 December 2011
  C. 1 January 2016 - 31 December 2018
  D. 1 January 2018 - 31 December 2020
  Answer: 