Answer is: A. 2H₂O.
Balanced chemical reaction:
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O.
There are same number of atoms on both side of chemical reaction.
NaOH is sodium hydroxide.
H₂SO₄ is sulfuric acid.
Na₂SO₄ is salt sodium sulfate. Sodium has oxidation number +1 and sulfate has charge -2.
H₂O is water.
Acids and bases when react (neutralisation) produce salt and water.
