Question

1. which technological development made it possible to build skyscrapers? steel production electric street cars photography electric lighting

Explanation:

To determine the technological development that enabled skyscraper construction, we analyze each option:

• Steel production: Steel is strong, lightweight, and durable, making it ideal for constructing tall buildings (skyscrapers) as it can support heavy loads and withstand forces better than traditional materials like wood or brick.
• Electric street cars: These are for urban transportation and have no direct role in skyscraper construction.
• Photography: A medium for capturing images, unrelated to building skyscrapers.
• Electric lighting: Used for illumination within buildings, not for the structural ability to build skyscrapers.

So, steel production is the key technological development for skyscraper construction.

Answer:

A. steel production