Answer:
The technological development that made it possible to build skyscrapers is C. steel production. The invention of the Bessemer process in the mid-19th century made it possible to mass-produce high-quality steel at a lower cost, which enabled architects and engineers to design and construct taller buildings. Prior to the widespread availability of steel, buildings were typically constructed with masonry or cast iron, which had limitations in terms of height and weight-bearing capacity. Steel was able to provide the necessary strength and durability to support the weight of tall buildings, and allowed for the development of the skyscraper as a new architectural form.