Which of the following reactions best illustrates the Law of Conservation of Matter? A.) H2O2H2O + O2
B.) Na + CuS Na2S + 2Cu
C.) K + AgCl KCl + Ag
D.) NaOH + 2HCl NaCl + H2O

C) the increase in atmospheric pressure pushes the walls of the balloon outward thus making it  is the answer.hope i you.

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