The option that explains how the Constitution limits government power and signifies the idea of popular sovereignty in American government is:
• The preamble starts with "We the People."
This phrase signifies that the government's authority is derived from the consent of the governed, emphasizing the principle of popular sovereignty. It reflects the idea that the power of the government comes from the people, thereby limiting government power by establishing that it must operate with the approval and in the interest of its citizens.