问一个逻辑题

dandan74

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?
(A) Where public-service workers are permited to strike, contract negotiations with those workers are typically settled without a strike.
(B) Where strikes by all categories of public-sector workers are outlawed, no acceptable substitutes for the services provided by any of those workers are available.
(C) Binding arbitration tends to be more advantageous for pubblic-service workers where it is the onlky available means of settling labor dispute with such workers.
(D) Most categories of public-sector workers have no counterparts in the private sector.
(E) A strike by workers ina  local government is unlikely to be settled without help from an arbitrator.
为什么选A呢，这道题诗什么意思呢? 我总是无法建立答案和原题的联系。求教！求教

liu9903

如果我没记错的话，答案好像是C！