The answer is D. The members of the working class were forced into unhealthy and dangerous living conditions.
Since you provided no options, I will assume that you are looking for one way to continue this sentence and here it is:
<span>In the century prior to the birth of Christ, majority of the population in the Roman empire believed in the Greek and Roman understandings of mythological gods. These included the likes of Zeus and others, which each held a specific significance in the material world.</span>
Because people go to worship there I think