Answer:
The constitution reflects the principle of popular sovereignty because it ensures the power of the people.
Step-by-step explanation:
"Popular sovereignty is the principle that the authority of a state and its government are created and sustained by the consent of its people, through their elected representatives".
For God's sake, the first line of the preamble is "We the People..." which demonstrates that is was built upon the people's wishes.
Hope this helps. :)