Answer:
The Gospel of Wealth supported rich industrialists by saying that their wealth eventually benefited the poor. Social Darwinism defends capitalism by saying that their wealth is earned through the natural order of nature. Both supported capitalism, but had different ways of expressing and defending their views.
Is there options if not I would say government.
The traditional economic system was based on the direct exchange of goods and services, for example: you give me a shirt that you have and I give you the shoes! So, from the options the best answer is: passing clothes down from older to younger brother.
The building material that the Romans used was concrete.
Wrong category, this is the history category buddy.