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Which of the following equations represents a synthesis reaction?

A) $"CH"_4"+2O"_2$$rarr$$"CO"_2"+2H"_2"O"$

B) $"AgNO"_3"+NaCl"$$rarr$$"AgCl"+"NaCl"$

C) $"H"_2"O"_2$$rarr$$"H"_2"+O"_2"$

D) $"2Na"+"Cl"_2"$$rarr$$"2NaCl"$

E) $"Mg"+"2HCl"$$rarr$$"MgCl"_2"+H"_2$

Answer: D