It would be letter B.Presidential actions
It's some Halloween tradition to say "Trick or Treat" for candy when you knock on someone's front door. :D
We can get to places way faster and have actually scheduled times
The first president of Germany was Friedrich Ebert
Answer:
The elevator revolutionised the Vertical transportation and logistics. Prior to that, even though the usual transportation between places was developed mainly because of the advancements in the vehicle and naval transportation, moving things "up" and vertically was supper difficult. Mainly moving people.
The elevator allowed the development of the Skyscraper. Tall buildings that could house thousands of people and eventually that would become the symbol of America.
Explanation: