From the passage, we get to know that astronauts are at greater risk of radiation damageA．

From the passage, we get to know that astronauts are at greater risk of radiation damage

A．if they have less iron concentration.

B．if they have more folate supplements.

C．if they have no gene variations.

D．if they have flown further into the space.

请帮忙给出正确答案和分析，谢谢！

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