Which operation is not closed for polynomials? a) add a trinomial to a trinomial b) divide a binomial by a trinomial c) multiply a binomial by a binomial d) subtract a binomial from a trinomial

Option B is the correct choice.

Step-by-step explanation:

Since we know that polynomials are closed under addition, subtraction and multiplication but not under division because division of two polynomials is not necessarily a polynomial.

Dividing a binomial by a trinomial will result in a rational expression and it will have negative exponent. Negative exponents are not allowed in polynomials.

Therefore, option B is the correct choice.