what is the effect of the following on the volume of 1 mol of an ideal gas?

a. the pressure is reduced by a factor of 4 (at constant t)
b. the pressure changes from 760 torr to 202 kpa, and the temp. changes from 37degrees c to 155 degrees kelvin.
c. the temp changes from 305 degrees kelvin to 32 degrees c, and the pressure changes from 2 atm to 101 kpa?

I am pretty sure that the effect on the volume of 1 mol of an ideal gas is being revelesd by the option : B. The pressure changes from 760 torr to 202 kPa, and the temp. changes from 37degrees C to 155 degrees kelvin. I choose this one because you have to use ideal gas law - V= nRT/P and you will see the doubled pressure in here : 760 torr= 1atm and 202kPa = 2 atm.
Do hope it helps! Regards.