Answer:
A
Explanation:
The correct answer would be that a new substance is formed.
When magnesium wire is burnt in the presence of oxygen, the wire reacts with oxygen and a new substance known as magnesium oxide is formed. The new substance is usually white in color and the equation of the reaction is as below:
[tex]2 Mg (s) + O_2 (g) --> 2 MgO (s)[/tex] (white)
Hence, the correct option is A.
