是应该选A ， Like almost all daily cycles of animals deprived of environmental cues, those measured for the horseshoe crabs in these conditions were not exactly 24 hours.（跟很多白天周期……的一样，那些夜间的也是确切的24小时，）such...（例如……），其实按照文中所说一个循环周期本来就不是正好24小时的（Such a rhythm whose period is approximately—but not exactly—a day is called circadian）
选A
C中的all animals 和 horseshoe crabs不符
而ranged from 22.2 to 25.5 hours也是解释前文not exactly 24 hours.
a
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