In which of the following changes is ∆S negative ?

• A H₂O_(l) → H₂O_(s)
• B C_(s) + 1/2O_{2,/sub>(g) → CO(g)}
• C PCI_5(g) → PCl_3(g) + Cl_2(g)
• D NaCl_(s) + aq →Na_{+ (aq)} + Cl_{- (aq)}
• E NH_3(g) + HCl_(g)