______it is, a dream or a scientific fact, all thinkers about the space travel have agreed

______it is, a dream or a scientific fact, all thinkers about the space travel have agreed on one thing: the trip is worth making.

A．Whatever

B．Whoever

C．Whosever

D．Whichever

请帮忙给出正确答案和分析，谢谢！

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