Question

this is the term that mean that the people are the only source of governmental authority.
popular sovereignty
habeas corpus
non - compos mentis
expecto patronum

Explanation:

Popular sovereignty is the principle that the people are the source of governmental authority. Habeas corpus is a legal remedy related to unlawful detention. Non - compos mentis refers to a person not of sound mind. Expecto Patronum is a spell in the Harry Potter series.

Answer:

A. Popular Sovereignty