Assuming you're referring to President Lincoln, no, he did not thing that how you make a living is a fixed or permanent condition, since he knew more than anyone how someone can rise up from being a poor "rail-splitter" to the president of the United States.
The overall impact of these three variables was greater economic prosperity for America. Business made more responsible lending and spending decisions, consumers were more confident in their investments and invested more, and the government intervened more when necessary.
The Answer Is:
(A.) "Their success encouraged people to experiment and invent new products"
