Answer: C. It will rise to 1.1 atm
Step-by-step explanation:
Gay-Lussac's Law: This law states that pressure is directly proportional to the temperature of the gas at constant volume and number of moles.
(At constant volume and number of moles)
where,
= initial pressure of gas = 1 atm
= final pressure of gas = ?
= initial temperature of gas =
= final temperature of gas = 300 K

Thus the final pressure will be 1.1 atm