With carbon dioxide what phase change take place when the temperature decreases from -40c to -80c at 2 atm

Can someone me with these questions plz.

The identities of substances are the same before and after which type of change

Which statement best describes the liquid state of matter? a. it has definite shape but indefinite volume. b. it has definite shape and definite volume. c. it has indefinite shape and indefinite volume. d. it has indefinite shape but definite volume.