Question

which of the following innovations had the greatest impact on standards of living in urban areas?
steam engine
telegraphs
electric cable cars
skyscrapers

Explanation:

The steam - engine was a key industrial innovation but mainly impacted production and transportation on a large - scale. Telegraphs improved communication. Electric cable cars enhanced urban mobility. Skyscrapers allowed for more efficient use of urban land, providing more housing and office space in limited areas, thus greatly impacting urban living standards by addressing population density and the need for space.

Answer:

skyscrapers