Answer : The correct option is, a salt
Explanation :
Neutralization reaction : It is a type of chemical reaction in which an acid completely neutralizes by the base to give a salt and water as a product.
When nitric acid react with ammonia base to form ammonium nitrate as a salt.
The balanced chemical reaction will be,

By the stoichiometry we can say that, 1 mole of nitric acid react with 1 mole of ammonia base to give 1 mole of ammonium nitrate salt.
Hence, the correct option is, a salt