SAT Subject US History Practice Question 228: Answer and Explanation
29. Which of the following inventions was necessary to the success of the multistory skyscraper?
A. Giuseppe Marconi's radio telegraph
B. Thomas Edison's lightbulb
C. Elisha Otis's elevator
D. Henry Ford's Model-T automobile
E. Alexander Graham Bell's telephone
Correct Answer: C
Without elevators, people had to walk upstairs; people would not walk up more than about five or six flights. To make taller buildings practical for use, the elevator was essential.