I think it is the third one because it just makes more sense to me
Answer:
The pressure of the gas would decrease
Explanation:
The conversation rate is c+273=k
When a large fissile atomic nucleus such as uranium-235 or plutonium-239 absorbs a neutron, it may undergo nuclear fission. The heavy nucleus splits into two or more lighter nuclei, (the fission products), releasing kinetic energy, gamma radiation, and freeneutrons
Just study it by looking it up