Answer is: j. double-replacement.
Double displacement reactions - cations and anions of the two reactants switch places and form two new compounds.
Neutralizationis is reaction in which an acid and a base react quantitatively with each other. In this reaction, there are no acids and bases, only salts.
Synthesis is reaction of two or more substances combining to make a more complex substance. In this example, there is more complex substance in products.
Oxidation-reduction reactions - change in the oxidation number between the reactants and the products. In this example there is no change in oxidation number of elements.