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单选题
According to the passage, which of the following will present the most difficult challenge for humans attempting interstellar space travel?
A
Achieving velocities near the speed of light
B
Withstanding the acceleration necessary for traversing interstellar distances
C
Maintaining clean air and water on a journey that could last centuries
D
Accommodating the effects of relativistic time dilation
E
Enabling the humans on board to survive during the journey
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参考解析
解析：
细节题。文章第四段中提到 “Keeping a crew alive on the way turns out to be the trickiest part of all.”，故本题选E项。
细节题。文章第四段中提到 “Keeping a crew alive on the way turns out to be the trickiest part of all.”，故本题选E项。
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