Which reaction has the largest increase in entropy?

A.     ${{\text{H}}_2}({\text{g)}} + {\text{C}}{{\text{l}}_2}({\text{g)}} \to {\text{2HCl(g)}}$

B.     ${\text{Al(OH}}{{\text{)}}_3}{\text{(s)}} + {\text{NaOH(aq)}} \to {\text{Al(OH)}}_4^ - {\text{(aq)}} + {\text{N}}{{\text{a}}^ + }{\text{(aq)}}$

C.     ${\text{N}}{{\text{a}}_2}{\text{C}}{{\text{O}}_3}({\text{s)}} + 2{\text{HCl(aq)}} \to {\text{2NaCl(aq)}} + {\text{C}}{{\text{O}}_2}({\text{g)}} + {{\text{H}}_2}{\text{O(l)}}$

D.     ${\text{BaC}}{{\text{l}}_2}({\text{aq)}} + {\text{N}}{{\text{a}}_2}{\text{S}}{{\text{O}}_4}({\text{aq)}} \to {\text{BaS}}{{\text{O}}_4}({\text{s)}} + 2{\text{NaCl(aq)}}$

C