All highlighted examples show how Herbert Hoover (1874-1964) believed that once the federal government started to take directly participate in the economic system the inevitable outcome would be the loss of freedom.
In the first and second examples he is saying that once the government starts to take part, it goes all the way into the private lives of individuals which would be an attack against the basis of freedom.
Hoover thought like this because for him freedom only exists in the private life when it's kept away and separate from the government.
The third and fourth examples have the same meaning as the priors only now he is talking specifically about economics. He believed the problem of the Great Depression should be figured out by private businesses and the government should only cushion the situation.
1.) The Japanese expansion in east Asia began in 1931 with the invasion of Manchuria and continued with a brutal attack on China (specifically southern China)
2.) Japan attacked French Indochina in 1940 as an effort to embargo all imports into China, including war supplies that China purchased from the U.S. This move prompted the United States to embargo all oil exports from Japan. (This one is probably natural resources)
3.) The Japanese attacked Pearl Harbor in an attempt to completely negate the United States' forces from counterattacking their capture of the Philippine Islands
I would say the answer is D., sadly. African Americans did not receive equal pay as whites did.