C. by race
the policy of apartheid separated them by race in south africa
In a free market, only the goods and services that are needed/ desired or required by consumers are produced: only those that will eventually be bought and paid for.
Answer:
<u><em>Railroad expansion make natural resources more available in the United States</em></u> by making it possible for natural resources to be transported to different cities and towns.
Explanation:
The growth of the railroads affected the supply and demand for natural resources in the United States in that the growth of the railroads increased the demand for natural resources. <u><em>Natural resources such as coal became more available</em></u> in all the country due to the railroad expansion.
<em>Brainliest?!</em>
B is correct.
please vote my answer brainliest. thanks!