Answer:
The First Amendment
Step-by-step explanation:
The First Amendment to the U.S. Constitution makes a clear separation between religion and the state by preventing the government from creating a nationally recognized religion, as well as to prohibit it to restrict an individual’s religious practices. So, if there were a law that made prayers before lunch mandatory (which would be a way of endorsing one religion over another, and recognizing it as the religion of the state), such law would violate the 1rst Amendment.