In an isochoric process, the internal (thermal) energy of an ideal gas decreases by 100 J. How much work is done by the gas during this process

Then the answer would be d then

Honestly "global warming" may be a slight possiblity, however they called it "climate change" because its not real, in fact we had one of our coldest days here not too long ago, and the "issues" with this subject is a blindfold for actual problems.

Not what goes around on earth but the universe too.