Using a steel framework with masonry sheathing, the , designed by Louis Sullivan, is thought by many to be the first genuinely modern building.

The options for this question are tue following:

a. wainwright building

b. eiffel tower

c. crystal palace

d. lever house

e. chrysler building

The correct answer is a. wainwright building .

Explanation:

The Wainwright Building (also known as the Empire State Office Wainwright) is a 10-story red brick office building on 709 Chestnut Street in downtown St. Louis, Missouri. The Wainwright building is one of the world's first skyscrapers. It was designed by Dankmar Adler and Louis Sullivan in the Palazzo style and built between 1890 and 1891. It was named for the local brewer, construction contractor, and financier Ellis Wainwright.

The building, listed as a reference point both locally and nationally, is described as "a very influential prototype of the modern office building" by the National Register of Historic Places. Architect Frank Lloyd Wright called the Wainwright building "the human expression of a first steel high in charge of capacity as architecture."