Answer: B
Explanation: Lost Generation, a group of American writers who came of age during World War I and established their literary reputations in the 1920s.
This is self-explanatory. If President Grant was busy with scandals, he wouldn't have time to focus on Reconstruction efforts in the South! He wouldn't be able to put as much effort towards it.
The correct answer is The Wealth of Nations.
This novel was written by Adam Smith, a famous economist and philosopher. In it, he described what a nation's wealth is, and how to achieve it, which makes it instrumental for the Free Enterprise system as we know it today. Before this book, it was much different.
I believe the answer is "technology".
The correct answer is Transition