Answer:
The second choice:
[tex]\large\boxed{\large\boxed{1/x\cdot x=1}}[/tex]
Explanation:
The closure property on an operation means that the operation between two elements of a set produce one element of the same set.
In this case, the operation is multiplication and the set is the polynomials.
Then, the closrue property is that the multiplication of two polynomials will always produce a polynomial.
Since, [tex]1/x[/tex] is not a polynomial, the equation [tex]1/x\cdot x=1[/tex] does not support the fact that polynomials are closed under multiplication.
