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Answer :

[tex]H_2 + O_2 = H_2O[/tex]

Here H is balanced but Obis unbalanced

So put 2 to H20 to balance O

[tex]H_2 + O_2 = 2H_2O[/tex]

now H becomes unbalanced

So put 2 before H2

[tex]2H_2 + O_2 = 2H_2O[/tex]

option a is correct

~Tulpe⚘