Answer:
option (3)
Step-by-step explanation:
According to the ideal gas equation 
PV = nRT 
where, P is pressure, V is volume, R is gas constant and T be the absolute temperature. 
At constant volume, 
P ∝ T 
If the temperature is doubled, the pressure also doubled. 
As volume is constant, so the density is also constant. 
So, the pressure is doubled and the density remain constant.