Which of the following situations exhibits a reasonable limit placed on the First Amendment in the interest of the common good?

a. Television shows are canceled when criminals claim they learned how to commit crimes by watching.
b. Groups of three or more people must obtain a license from the city before meeting in any local parks.
c. News reporters traveling with troops overseas must not reveal their location or the soldier's identities.
d. A confessed criminal is forced to speak in court and describe his or her crimes in detail for public record.