I belived they learn what went wrong with another place and tried to fix its errors
The 18th century if you are looking for a century as an answer. Hope this helps!
Answer:
A. scandals that damaged the reputations of various presidents.
Explanation:
All of the above are examples of major scandals that happened while certain presidents were in office.
Credit Mobilier was in 1867, Teapot Dome 1921-1923, Watergate 1972.
The most talked-about scandal would be the Watergate since it was a major letdown at the time and the most recent one.