Answer:
the Answer is B
Step-by-step explanation:
These workers would dock the lift on the appropriate floor. They would also announce which businesses or offices were on a floor. An elevator that allowed a passenger to press a button and move the elevator to the selected floor would not be invented until the 1950s. The true benefit of this invention can be seen in large cities like New York City or London, where people live and work inside tall buildings. Elevators allow quick and easy access between floors. In these busy buildings, hundreds of people might exit or enter an elevator at any given second.