Answer:
Sodium and water
Explanation:
We are given with the word equation :
sodium + water + sodium hydroxide + hydrogen
It is required to find that the reactants of the above equation.
In terms of chemical formula we can write it as :

Reactant of a chemical equation are the elements that are present on its LHS. These are the components of which the equation is composed of. So, the reactants of the given equation are sodium and water.