Which of the Following Is True Regarding Obscene Speech

Which of the following is true regarding obscene speech?

A) It cannot be prevented, but can be subject to time, place or manner restrictions.
B) Because the definition of obscene is so subjective, it cannot be restricted or prevented.
C) Even though the definition of obscene speech is subjective, if speech is determined to be obscene, it loses all constitutional protection.
D) Obscene speech and offensive speech receive the same degree of protection.
E) The U.S. Supreme Court has set out a clear definition of what speech is defined as obscene and therefore unprotected.