Which sample of CO2 has a definite shape and a definite volume?

(1) CO2 (aq) (2) CO2 (g)

(3) CO2 (l) (4) CO2 (s)

The answer is (4) CO2 (s). The "aq" means solution. The "g" means gas. The "l" means liquid. If you want to have definite shape and volume. It must be solid. The liquid also has a definite volume but does not have definite shape.