Answer:
B. Publishing a newsletter claiming that Americans of a certain racial
group are superior
Explanation:
The following are not considered for the following reasons:
a. Refusing to testify in Court is the Fifth Amendment.
c. Delivering speech accusing a crime you know the person did not commit is defamatory and NOT protected by the constitution.
d. Cross in Federal buildings, cannot mix church and state.
That leaves only correct answer as B. To publish racial superiority. Since that is an opinion, even bad opinions are allowed as it is not defamatory.