The question asks to identify the United States court case that established a specific "three-pronged test" to define obscene content.
The Supreme Court case Miller vs. California (1973) is the landmark decision that defined obscenity through a specific legal standard.
This ruling established the "Miller Test," which consists of three essential prongs that must all be met for material to be considered legally obscene under the First Amendment:
Option C, Miller vs. California 1973, correctly identifies this pivotal case.