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4 g of an ideal has (vapour densely = 20...

`4 g `of an ideal has `(vapour densely = 20)` is taken in abulbe od `10 dm^3` volume, at a temperature of` T` K.The bulb is present on thermostat maintained at a temperature `125°C` more than the initial. To maintain original pressure, `0.8` g of gas has to be removed, then the value of T is

A

`500 K`

B

`400 K`

C

`250 K`

D

`160 K`

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