Which statement is an example of a major counterclaim to address in an argumentative research essay with this claim

CLAIM: All schools should be equipped with metal detectors.

A good statement that is an example of a major counterclaim to address in an argumentative research essay with the claim: "All schools should be equipped with metal detectors" can be that installing metal detectors would be a too high cost to afford for most schools. Because it is not only the costs of metal detector machines, but also there must be a security man controlling the machines, and if schools could not afford these costs it should be provided by the state government.

The correct answer is: The costs associated with installing metal detectors would be too high for most schools