The correct answer is D) a trial regarding the teaching of evolution in public schools,
Clarence Darrow and William Jennings Bryan faced each other in the 1920s in the following legal circumstance: a trial regarding the teaching of evolution in public schools.
We are talking about "The Scopes Trial" of 1925 that confronted two of the most renown attorneys in the United States: Clarence Darrow and William Jennings Bryan. Tennessee schoolteacher Joseph Scopes was prosecuted for teaching evolution theory in class, something that had been prohibited by the Butler Act.