The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be ___________________?

• A. 2 meters of water column
• B. 3 meters of water column
• C. 3.5 meters of water column
• D. 4 m of water column
• E. none of the above