Option B is the
correct answer as 'resentment' means 'the feeling of bitterness for unfair
treatment'. It is relevant to the situation described "workers angrily voiced their resentment". Hence option B is correct.
'Preservation' means 'the act of protecting
something'. This meaning isn't relevant to the sentence, also, 'preservation' cannot be 'voiced'. Hence option A is incorrect.
'Irritation’ means ‘being annoyed’, it refers to slight anger whereas the adverb "angrily" does not suggest slight anger. Hence option C is incorrect.
Option D is incorrect because 'resistance' means 'refusal to accept something', using this word, the meaning of the sentence is not clear.