请教归纳型逻辑题一道

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 statement above best support which of the following conclusions?

C) Binding arbitration tends to be more advantageous for public-service workers where it is the only available means of settling labor disputes with such workers.

为什么选这个，我从题目中没有读出这个意思来啊， 哪位牛人帮忙分析一下，怎么就得出这个结论了。。。。