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Answer:
A. moving heavy materials inside buildings
Explanation:
<h2>What were elevators used for in the past?</h2>
They were mostly used to lift heavy loads, such as building materials.
<h2>
What are elevators used for now?</h2>
An elevator now transports people or freight between floors, levels, or other structures.
<h2>
When was it first introduced?</h2>
Elisha Graves Otis introduced the first passenger elevator at the Crystal Palace Convention in New York City.
Elisha's invention (The Elevator) amazed spectators at the convention, and the first passenger elevator was installed in New York City in 1856.
<h2>
Hope this helps!</h2>
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