Answer: C. Rebates
Explanation: A rebate is a partial refund to someone who has paid too much money for tax, rent, or a utility, and is not an income source.
The answer is Navajo code
The south improvement company in 1872 caused rockefeller able to monopolized around 90% of the oil market in North America.
The south improvement company largely increased the number of oil and railroad companies in southern states. Because of the increase in numbers, the market for oil and railroad companies became saturated. This lead many of his competitors to bankruptcy, which is why the competitors called it a conspiracy.
