Obscenity:

A. Has been given constitutional protection.
B. Was effectively defined by the Supreme Court in Miller v. California.
C. Is considered legal free expression.
D. Can be illegal if it is found to violate a four-part test established by the U.S. Supreme Court in Miller v. California.
E. Was effectively defined by the Supreme Court in Lemon v. Kurtzman.

Obscenity, as defined by the U.S. Supreme Court in Miller v. California, is not protected by the First Amendment and is determined through the Miller Test.

Explanation:

Obscenity is a concept that is not protected by the First Amendment, but its definition has been established by the Supreme Court in Miller v. California. The Court set forth a three-part test known as the Miller Test to determine if something is obscene, incorporating criteria like appealing to prurient interests and lacking serious value.

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