Which of the following is an appropriate title for this passage？A．Ready for a Round Trip t

Which of the following is an appropriate title for this passage？

A．Ready for a Round Trip to Mars.

B．Ready for a Short Visit to Mars.

C．Ready for a One-way Trip to Mars.

D．Ready for a Walk on Mars.

请帮忙给出正确答案和分析，谢谢！

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