rAilwAy workErs joinED in thE strikE BECAusE thEy ______.
A．AttEmptED to hAlt thE wholE nEtwork For trAin trAvEl
B．wErE DissAtisFiED with proposED risE in unEmploymEnt
C．wErE unhAppy with thEir working ConDitions
D．wAntED to support workErs From othEr unions