In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.
Liquid water cannot exist on the surface of Mars as to low (a)/ atmospheric pressure, which is less than 1% of Earth's, (b)/ except at the lowest elevations for short periods. (c)/ No error (d)
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