In which reaction will the entropy of the system increase significantly?

A.     \({\text{CaC}}{{\text{O}}_3}{\text{(s)}} \to {\text{CaO(s)}} + {\text{C}}{{\text{O}}_2}{\text{(g)}}\)

B.     \({{\text{H}}_2}{\text{O(g)}} \to {{\text{H}}_2}{\text{O(l)}}\)

C.     \({\text{HCl(g)}} + {\text{N}}{{\text{H}}_3}{\text{(g)}} \to {\text{N}}{{\text{H}}_4}{\text{Cl(s)}}\)

D.     \({\text{NaOH(aq)}} + {\text{HCl(aq)}} \to {\text{NaCl(aq)}} + {{\text{H}}_2}{\text{O(l)}}\)

A