A $H_{2}O (g) \rightarrow H_{2}O (I)$
B $H_{2}O (I) \rightarrow H_{2}O (g)$
C $H_{2}O (s) \rightarrow H_{2}O (I)$
D $H_{2}O (s) \rightarrow H_{2}O(g)$
Correct Answer: Option A
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