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. 3 metres of water column

B. none of the above

C. 4 m of water column

D. 3.5 metres of water column

E. 2 metres of water column

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