Final answer:
The three countries that aren't part of OPEC are the United States, Canada, and Mexico.
Step-by-step explanation:
The three countries that aren't part of OPEC are:
- United States
- Canada
- Mexico
OPEC, the Organization of Petroleum Exporting Countries, is a consortium of oil-producing countries that hold a significant portion of the world's oil reserves and influence global oil prices. The countries listed in option b) are not part of OPEC. These countries have significant oil production but choose not to be members of the organization.