The answer is...(drum roll)...
A. Election reform
This answer is 100% correct, have a great day. Glad to help you. :)
Aimed to overcome legal barriers at the state and local levels that prevented African Americans from exercising their right to vote<span> under the 15th Amendment (1870) to the Constitution of the United States</span>
If a case is heard by the U.S. Supreme Court and the government is one of the parties involved, then the Solicitor General would represent the government. The correct option among all the options given in the question is option "b". If the United States is not directly involved in the case, then also the Solicitor general can give his views.
These propagandas promoted things throughout WW2. For exmaple, promoting the idea that working was a woman's patriotic duty.