"That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government."

b. social contract

Explanation:

This text in the Declaration of Independence is influenced by John Locke's Social Contract theory which believes that people only enact a government that will keep them safe and secure to allow them pursue their daily lives with liberty.

If the government is unable to do that then the people have the right to overthrow such a government and institute a new one that will act in such a way as to bring them safety and happiness.