D.
The products will have at least 2 Na atoms and 1 O atom.
Further explanation
If we refer to the law of mass conservation, which states that
In a closed system, the masses before and after the reaction are the same
then the number of atoms in the reactance will be the same as the number of atoms in the product
In this problem it is known that Na₂O is one of the reactants so that the product of Na atoms and O atoms will at least equal the number of atoms in the bond, namely 2 Na and 1 O
Like an example of this Na₂O reaction:
Na₂O + H₂O ⇒ 2 NaOH
Na : left =2, right = 2
O : left=2, right = 2
