A, use a compressor to press carbon dioxide into the seabed, and the outside world does positive work on carbon dioxide gas, so A is correct;

B, carbon dioxide gas releases heat after liquefaction, so B is correct;

C, D, deep in the seabed, the pressure is very high and the temperature is very low, so the carbon dioxide gas releases heat after liquefaction and the temperature decreases; The average kinetic energy of molecular thermal motion decreases, but not every molecule's kinetic energy decreases, so C is right and D is wrong.

I chose the wrong topic, so I chose D.