Because m(n(x)) is n(m(x)), the composition of m and n is not commutative.

The statement says m(n(x)) is n(m(x)). These are the two possible orders of composing m and n, so the composition is commutative when they are equal. The correct choice is “is not equal to,” which makes the statement read: Because m(n(x)) is not equal to n(m(x)), the composition of m and n is not commutative.

AI-written and checked against the verified answer.