challenge: Who were the defending champions of the 2014 President's Cup – Women's doubles?
  
  A. Elena Vesnina and Ekaterina Makarova
  B. Serena Williams and Venus Williams
  C. Vitalia Diatchenko and Margarita Gasparyan
  D. Lyudmyla Kichenok and Nadiia Kichenok
  Answer: 