In the following question, some part of thesentence may have errors. Find out whichpart of the sentence has an error andselect the appropriate option. If a sentenceis free from error, select 'No Error'.
Liquid water cannot exist on the surface ofMars as to low (1)/ atmospheric pressure,which is less than 1% of Earth's, (2)/except at the lowest elevations for shortperiods. (3)/ No error (4)

Options

A. 1
B. 2
C. 3
D. 4

Answer

A