Final answer:
Obscene speech is not protected by the First Amendment, whereas burning a flag is generally protected as a form of political expression.
Step-by-step explanation:
The speech that is not protected by the First Amendment of the Constitution of the United States is obscene speech. This type of speech, along with libel, slander, fighting words, threats, and incitement to lawless conduct, can be constitutionally limited. On the contrary, burning a flag has been recognized by the Supreme Court as a form of expressive conduct and is protected, especially when it involves political speech. Thus, the correct answer is b. Obscene Speech.
Most types of political speech are generally upheld as protected by the First Amendment because they are at the heart of what the Amendment seeks to protect. However, the high value placed on political speech does not extend to all forms of expression. For instance, although political speech is broadly protected, if it crosses over into libelous claims or direct threats, it loses those protections.