I need help I don’t really get what I have to do to get the answer

Reactants are what you start with. Products are what come into being by or through the reactants. You can figure out what the products are in these sentences (which are really chemical equations written out in words rather than symbols) by looking for terms like “yield(s)/to yield,” “form(s)/to form,” “produce(s)/to produce,” “give(s)/to give,” etc. All of these terms provide the notion that you’re getting or making something. The specific substance(s) that follow these terms would be your product(s); the substance(s) that precede these terms would be your reactant(s).

So, for question 2, we see the term “produces.” There is one substance that precedes that term—potassium chlorate, which would be our sole reactant. And there are two substances that follow that term—potassium chloride and oxygen gas, which would be our two products.

In question 3, we see the term “yields” preceded by ammonium nitrate—our sole reactant—and followed by nitrogen gas, oxygen gas, and water vapor—our three products.

Lastly, in question 4, we see the explicit term “produces.” Moreover, we are told directly that dinitrogen tetrahydride reacts with oxygen gas; it should be pretty clear that these two substances are our two reactants here. The substances that we are told are produced are nitrogen gas and water, which would be our two products.