The correct answer is A) 1.2 times. In an axial-compressor of a gas turbine, each stage of the compressor can typically compress the atmospheric air by a factor of around 1.2 times. This is because the compression ratio of a single stage in an axial-compressor is generally around 1.2 to 1.4, with higher overall compression ratios achieved by having multiple stages in the compressor. The other options (B, C, and D) are incorrect as they represent higher compression ratios that are not typical for a single stage of an axial-compressor in a gas turbine engine.