【单选题】

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

A、The meteors found onEarth were too young to have originated from the impacts in question.
B、The meteors found onEarth were too old to be easily dateD、
C、Not enough impact events have been recorded in recent history to explain how any young meteors would have reached theEarth.
D、Impacts on Mars have been so small that scientists question how any meteors have reached the earth.
E、The age distribution of meteors found onEarth was inexplicably based toward youth.