Answer:
D. the United States
Step-by-step explanation:
The map works by colors. The darker the color the more barrels were imported. So since the United States is the darkest of the four countries that means they imported the most oil based on the map.
The United States imported around 5 000 000+ barrels, China 2mil-3mil, Canada and Australia imported 500 000-1mil barrels of oil.