since the race was first held in 1979,it has cost scores of lives,including --of 25 competitorA them B these C THOSE

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since the race was first held in 1979,it has cost scores of lives,including --of 25 competitor
A them B these C THOSE

自从该项比赛在1979年首次举办以来,已付出了许多的生命,包括——那25位竞争对手
(C .those那、哪些)

B,指代前面提到的lives。
祝你好运啊