The correct answer is (b) 44 degree Celsius
The best I can explain: According to Gay-Lussac’s law, at the constant volume, the pressure is directly proportional to the temperature of gas so P1/P2 = T1/T2 that is 1.1 Bar/2.2 bar = 22 degrees Celsius/44 degree Celsius. So the temperature required is 44 degrees Celsius.