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Which scenario describes a pattern of exponential decay?
A: a backgammon competition has 10 players exiting after each round of games
B: a table tennis club has had 10,9, and 8 new numbers in three years, respectively
C: a billiards organization lost 5%,4%, and 3% of its members in three years, respectively
D: an elimination chess tournament has half the number of players on each successful round