Which quotation best represents the principle of popular sovereignty in the U.S. Constitution?

The principle of popular sovereignty is fundamentally about the government's authority deriving from the consent of the governed. This means that the people have the ultimate power to shape their government and its policies. The correct choice, which focuses on the right to alter or abolish the government by the people, directly aligns with this principle. This concept reflects the idea that citizens can establish a new government or reform an existing one if it fails to serve their needs or protect their rights.

In contrast, while other options touch upon important rights and freedoms, they do not capture the essence of popular sovereignty. The freedom to express subjective thoughts pertains more to individual rights under the First Amendment. Protection against unreasonable searches relates to the Fourth Amendment and individual privacy rights rather than the framework of governance. Access to legal remedies for personal grievances is crucial for justice but does not encompass the collective power of the populace to influence or change government structures. Thus, B is the most representative of the principle of popular sovereignty in the U.S. Constitution.