The British Parliament believed that the purpose of the English Bill of Rights was primarily to outline the rights that people already had and to ensure certain civil liberties and parliamentary rights. It was a response to the abuses of power by the monarchy, particularly under King James II, and aimed to limit the powers of the king while affirming the rights of Parliament and the individual.
Thus, the most accurate statement among the options provided is: Parliament was listing the rights that people already had. While the document did also emphasize the right of Parliament and the people to resist a tyrannical ruler, it did not explicitly give British nobles the rights to overthrow the king, nor was it asking the people to vote on which rights to grant.