ASAP PLEASE

If I have 21.0 L of gas at a pressure of 78.0 atm and a temperature of 627°C. What is
the new temperature in Celsius, if the volume becomes 30.3 L and the pressure
decreases to 45.0 atm?

a. 749 celsius
b. 808 celsius
c. 535 celsius
d. 476 celsius