During the post-World War 2, economic boom,following group became a new target for advertisers :
It was a baby boom era and businesses wanted to target teenagers because they had money in their pocket as they had jobs.
It made mney throguh shipping and trade
The conditions in the South during Reconstruction
Even though Southern states rejoined the Union and agreed to the 13th amendment (which outlawed the institution of slavery), the South looked very similar to what it did before the Civil War started. Even though African Americans were technically free, many of them still worked on plantations. There work on plantations was under the system known as sharecropping. Sharecropping is a system in which a person leases land from a farm owners. In return, the worker promises to give land owners a share of their crop. This system resulted in strict labor contracts. Ultimately, this system would tie African Americans to plantations as plantation owners used loopholes within the contract to keep their tenants from finding other opportunities.
Along with this, African Americans were still treated horribly in the South. The development of the Ku Klux Klan, a white supremacist organization, resulted in the beating and killing of thousands of African American citizens. This group was created in order to strike fear in the hearts of African American citizens and to prevent them from using their newly gained rights (like the right for men to vote).
Lastly, the South would continue to treat African Americans as inferior by the implementation of black codes and Jim Crow laws. These laws allowed for the development of segregated public and private facilities.
Some people consider the way the media covers candidates for public office bad for democracy due to the way they present the facts and evidence. e.g. Whenever Donald Trump was running for presidency they constantly reported on his sexual abuse accusations instead of his good deeds and samaritan actions. He helped in the recovery from the flood in Louisiana and sent food and shelter for the suffering families, but you never heard that on the news... They broadcast the information in a way that will attract the most viewers, not in a way that delivers the most factual and true information.
To my knowledge, the correct answer among all of the given choices is C.) Steam. If I'm not mistaken, this was the time that more trains came into use.
I hope this is the answer you were looking for and that it helps!! :)