What are the signs for the change in enthalpy and change in entropy when a system undergoes the phase transition of freezing?
A. ∆H < 0 , ∆S < 0
B. ∆H > 0 , ∆S > 0
C. ∆H < 0 , ∆S > 0
D. ∆H > 0 , ∆S < 0
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