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Which sentence reflects the correct usage of a plural possessive noun?

AOlympic snowboarders determination drives them through the rigorous' training required to remain competitive in the sport.
BOlympic snowboarders's determination drives them through the rigorous training required to remain competitive in the sport.
COlympic snowboarders' determination drives them through the rigorous training required to remain competitive in the sport.
DOlympic snowboarders determination drives them through the rigorous's training required to remain competitive in the sport.