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Question 1:
The images of Mars taken by the Mariner 9 probe indicate the presence of valleys that looks like the stream beds on Earth. The images also show that Mars once had an atmosphere that was thick enough to trap Sun's heat. If this is true, something must have happened to Mars billions of years ago that stripped away its atmosphere.
A. Mars has little or no atmosphere.
Feedback As per the paragraph, Mars once had a thick atmosphere, and it was stripped off. The other choices are true or false can't be predicted from the given paragraph.
B. Mars once had an atmosphere thicker than Earth's atmosphere.
C. Mariner 9 probe took the first picture of Mars.
D. Mars is closer to Sun than Earth.

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