The sentence is talking about many workers but at the same time, is using 'each' before the word 'workers'. 'Each' refers to individual workers separately. So, we need to use singular words in both the given blanks since we are referring to each worker. This rules out options with plural verbs and pronouns 'have' and 'their' i.e options B, C, and D. Hence, the correct answer is option A) 'has, his' with the singular verb 'has' and singular pronoun 'his' that agrees with the singular subject 'each' of the workers.