Hey there!
Plebians made up 95 percent of the Ancient Roman population. They could be wealthy, but they stayed Plebians for their whole lives and were known as "the many".
Your answer is B. Both worked many occupations to assist either fellow Plebians, but more often the Patricians. During the Conflict Of The Orders which lasted from 494 BC - 287 BC, the Plebians left the city and the Patricians realized that it was the Plebians that did all the work, and they were a necessary part of society.
I didn't choose A because slaves could not vote in assemblies, and although it was probably something that happened, they were not abused often (Plebians).
Hope this helps!