Identify the reaction/process in which the entropy decreases.
- A$H_2O(l) \longrightarrow H_2O(s)$
- B$H_2O(l) \longrightarrow H_2O(g)$
- C$H_2O(g) \longrightarrow 2H(g) + O(g)$
- DCrystal $(100 \ K)$ $\longrightarrow$ Crystal $(200 \ K)$
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