Answer: A. The close, regular arrangement before the change represents a solid; the widely separated particles after it represent a gas. The direction is solid → gas, which is sublimation.
B: reverses the direction: deposition is gas → solid.
C: identifies the initial solid but treats the final state as liquid; melting is solid → liquid.
D: identifies the final gas but assumes the initial state is liquid; vaporization is liquid → gas.
Remember: identify both states and the direction of change.