A quick way to confirm this is by lining up the architects on a timeline and checking who was active when the skyscraper was actually invented, in the 1880s-1890s in Chicago.
The one name that both fits the correct era and is specifically credited as the originator of the type is Louis H. Sullivan.
Therefore, the correct answer is Louis H. Sullivan.
Match the following UNESCO World heritage sites in Group-I with their relevant historic significance in Group-II.

In a regular semi-circular arch of 2 m clear span, the thickness of the arch is 30 cm and the breadth of the wall is 40 cm. The total quantity of brickwork in the arch is _______ m\(^3\). (rounded off to two decimal places)

A typical Classical Greek temple with Doric order columns is illustrated in the figure. Identify the correct terms corresponding to P, Q, and R marked in the figure.
