The correct answer is C) the posting would not be in violation of the clause because there is a learning purpose on the items.
According to the Establishment Clause, a historical society's posting of the Ten Commandments along with the history of religion and its beliefs and practices could be viewed in the following way. The posting would not be in violation of the clause because there is a learning purpose on the items.
The Establishment Clause that appears in the First Amendment to the United States Constitution prohibits Congress to establish an official religion. Under this legislation, nobody can pass a law to give preference to any religion. So the posting would not be in violation of the clause because there is a learning purpose on the items. No one is forcing nothing.