D) Seized lands were returned to their respective countries.
Explanation:
It was a peace treaty that ended the War of 1812 between the United States and the United Kingdom. The treaty restored the borders of the countries to the lines before the war started. It also released all the captured prisoners and ships.
The United Kingdom returned the United States the territories near Lake Superior, Michigan, and Maine. While the U.S. returned to the British the area of Upper Canada.