Answer:
(A) if they have been given reason to believe that their jobs will
Step-by-step explanation:
Option A is correct because it has 'if' a conditional clause that uses present perfect tense which should be followed by the main clause ''will''.
We can not use 'would' as an answer when there is a clear condition and we are certain of its prediction. This would make option B incorrect. The other options are also wrong, because the conditional statement 'if' is required based on the fact that that the court qualified a ruling that workers cannot be laid off.