Assertion (A) Solid CO2 changes its state when exposed to air.
Reason (R) CO2 undergoes sublimation.

(a) Both A and R are true and R is the correct explanation of the A.
(b) Both A and R are true but R is not the correct explanation of the A.
(c) A is true but R is false.
(d) Both A and R are false.

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