Answer:
c. never
Explanation:
When we find product of a binomial by a binomial, the result is never be a monomial.
Let me explain it to with an example.
Binomial is consist of two terms.
Let's take two binomials (x + 2) (x + 3)
Let's find the product of these two binomials.
(x + 2)(x + 3) = x^2 + 2x + 3x + 6
Simplifying the like terms, we get
x^2 + 5x + 6.
Which is a trinomial.
So the product of two binomial is a never monomial.