challenge: What was Bernd Upmeyer's role from 2012 to 2016 in relation to the Atelier International Grand Paris (AIGP)?
  
  A. He was the sole architect appointed for the mission: Grand Paris
  B. He was a member of the team led by the architecture firm STAR strategies + architecture
  C. He was the leader of the Scientific Committee for the mission: Grand Paris
  D. He was a member of the AIGP's executive board
  Answer: 