Lennox is a college student who is upset over U$.$S$.$ policy in the Middle East. To protest this, Lennox burns the American flag and is then arrested by campus police. Lennox may argue that

a$.$ protesting U$.$S$.$ policy is permitted under the Commerce Clause.

b$.$ college students are immune from prosecution.

c$.$ campus police do not have the authority to make arrests.

d$.$ flag burning is symbolic speech protected by the First Amendment.