A piece of magnesium metal is burned in air (containing oxygen gas), and a white powder of magnesium oxide is formed.The class of this reaction is:

A piece of magnesium metal is burned in air (containing oxygen gas), and a white powder of magnesium oxide is formed.The class of this reaction is:
A)combustion reaction.
B)single-displacement reaction.
C)decomposition reaction.
D)double-displacement reaction.
E)combination reaction.


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