According to the passage, astronomers studying Martian meteors discovered on Earth were perplexed by them for which of the following reasons

A．ThemeteorsfoundonEarthweretooyoungtohaveoriginatedfromtheimpactsinquestion.
B．ThemeteorsfoundonEarthweretoooldtobeeasilydated.
C．NotenoughimpacteventshavebeenrecordedinrecenthistorytoexplainhowanyyoungmeteorswouldhavereachedtheEarth.
D．ImpactsonMarshavebeensosmallthatscientistsquestionhowanymeteorshavereachedtheearth.
E．TheagedistributionofmeteorsfoundonEarthwasinexplicablybasedtowardyouth.