I think it is d but is definitely not b or c
The answer is C ship building
Answer: "The term plebeian referred to all free Roman citizens who were not members of the patrician, senatorial or equestrian classes. Plebeians were average working citizens of Rome – farmers, bakers, builders or craftsmen – who worked hard to support their families and pay their taxes."
True hopefully this helps you
Andrew Jackson was the first common man elected into presidency