Final answer:
Daniel Burnham and Edward Herbert Bennett were the authors of the Plan of Chicago, which contributed significantly to the City Beautiful movement and the 20th-century urban development.
Step-by-step explanation:
The authors of the Plan of Chicago were Daniel Burnham and Edward Herbert Bennett. The Plan of Chicago, also known as the Burnham Plan, is a prominent document in the history of urban planning. It was created as part of the City Beautiful movement, which sought to introduce beautification and monumental grandeur in cities. Daniel Burnham, a renowned architect and urban designer, played a pivotal role in the development of the City Beautiful movement. The Plan of Chicago envisioned wide boulevards, public spaces, parks, and civic buildings, influencing urban development throughout the 20th century.