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One liter of oxygen at a pressure of 1 atm, and 2 liters of nitrogen at a pressure of 0.5 atm. Are introduced in the vessel of 1 liter capacity, without any change in temperature. The total pressure would be         

A) 1.5 atm.

B) 0.5 atm.

C) 2.0 atm.

D) 1.0 atm.