GMAT Critical Reasoning (CR) | Re: For a local government to outlaw all strikes by its workers

For a local government to outlaw all strikes by its workers is a costly mistake, because all its labor disputes must then be settled by binding arbitration, without any negotiated public-sector labor settlements guiding the arbitrators. Strikes should be outlawed only for categories of public-sector workers for whose services no acceptable substitute exists.

The statements above best support which of the following conclusions?
(A) Where public-service workers are permitted to strike, contract