Which of the following correctly describes two of the notable achievements of the twin Viking spacecraft of the mid-1970s? A. They were the first spacecraft to get images of Mars; none of the previous spacecraft carried cameras. B. They made the first successful landings on Mars and performed experiments to search for life. C. They were the first spacecraft to orbit Mars successfully. D. They put the first people on the surface of Mars.

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A: By analyzing the question, We need to tell about ppm, Below you can find the answer.

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A: I think option B will be right answer.

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A:  

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A: By analyzing the question  Below you can find the answer.

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