When a substance goes directly from a solid state to a gas state, as dry ice does, it is called sublimation (option B).
Sublimation is the transition of a substance from the solid phase directly to the vapor state such that it does not pass through the intermediate liquid phase.
A good example of sublimation is dry ice, which changes from solid state to gaseous state (vapor).
Therefore, when a substance goes directly from a solid state to a gas state, as dry ice does, it is called sublimation.
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