The was one of the first great skyscrapers. a. Edgar Kaufmann Building
b. Frederick C. Robie Building
c. Fallingwater Building
d. Woolworth Building

the answer is D. Woolworth Building
i just wanna put this out here for people who need it in edg

d. Woolworth Building

Explanation:

The Woolworth Building is an early American skyscraper designed by architect Cass Gilbert and located at 233 Broadway in Manhattan, New York City. It was the tallest building in the world from 1913 to 1930, with a height of 792 feet (241 m). More than a century after its construction, it remains one of the 100 tallest buildings in the United States.

the answer of "what has three legs but never walks" is a yard stick. this answer can be found at

trying using google im so sorry