1 Answers

Option 1 : 1

''As to'' means ''concerning to or related to.'' But here we are giving a reason ''atmospheric pressure'' So what we must use is ''due to.'' It is used to give a reason for something. So option 1 is correct.

Correct sentence: Liquid water cannot exist on the surface of Mars due to low atmospheric pressure, which is less than 1% of Earth's, except at the lowest elevations for short periods.

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