Which of the following is a focus of the Bill of Rights?

The focus of the Bill of Rights is primarily on the protection of individual liberties and rights from government interference, particularly concerning fundamental freedoms that are essential to a democratic society. This includes the protection of freedom of speech and religion, which are explicitly outlined in the First Amendment. The Bill of Rights was adopted to ensure that individuals could express their beliefs and opinions without fear of government reprisal, thereby safeguarding essential democratic principles.

In the context of the other options, while the regulation of government powers is a significant aspect of the Bill of Rights, the specific framing of individual rights, particularly those relating to speech and religion, is more directly emphasized. Economic rights and national interests are not the central themes of the Bill of Rights, which is more focused on personal freedoms and protections against governmental overreach. Thus, the correct answer highlights the core purpose of the Bill of Rights in championing and protecting civil liberties.