How Are Interest Groups Legally Protected in the United States

How are interest groups legally protected in the United States?

A) Through labor laws
B) Through strong public support because there is little desire among elected officials to enforce laws that regulate them
C) Through the First Amendment of the U.S. Constitution, which guarantees the right of the people "to peaceably assemble and petition the government for redress of grievances"
D) Through most state governments, which do protect their rights, although the federal government bans lobbying by special interest groups
E) Through the U.S. Constitution, which creates and protects interest groups and vests them with powers to lobby Congress