Which of the following scenarios violate the First Amendment?

Select the 2 that apply Public school teachers are suspended by the superintendent after they march in peaceful protest on the sidewalk outside the school building before school hours to show support for better wages in their next contract. Students wear shirts with religious sayings on them. A private university cancels a controversial speaker after students protest. A student newspaper publishes an advertisement from an activist organization accusing the mayor of corruption; the ad has minor factual errors. A public school starts the day by saying a public prayer for all students during the announcements.