Asealed container with liquid water in the bottom was left standing at a constant temperature until the air above the water surface became saturated with water vapor. the resulting pressure exerted by the water vapor is known as the vapor pressure. the resulting vapor pressure value is unique to that particular temperature.

Saturation.

Explanation:

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In this case, the statement is accounting for the saturation vapor pressure as it is the pressure of a vapor which is in equilibrium with its liquid, in other words it is the maximum exerted pressure possible by the vapor at a given temperature or just the maximum amount of the vapor, so there is neither no more vapor that could condense nor more liquid that could boil.

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a is the correct answer