While It Is Easy to Say That Obscene Materials and Imagery

While it is easy to say that obscene materials and imagery should not receive protection under the First Amendment, it has proven difficult over time to regulate it, given that ___________.

A) pornographers often engage in protected political speech, despite appearances to the contrary
B) courts have repeatedly asserted that adults have a right to receive adult content
C) the courts say that governments can only regulate pornography when citing a legitimate public interest for doing so
D) defining or identifying obscenity is notoriously difficult, and impractical