A piece of magnesium metal is placed in a solution of hydrochloric acid, resulting in the formation of hydrogen gas and a solution of magnesium chloride.The class of this reaction

A piece of magnesium metal is placed in a solution of hydrochloric acid, resulting in the formation of hydrogen gas and a solution of magnesium chloride.The class of this reaction is:
A)single-displacement reaction.
B)decomposition reaction.
C)combustion reaction.
D)combination reaction.
E)double-displacement reaction.


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