Answer
A.) the United States can obtain units of coffee at less cost than it could before trade.
Work Step by Step
This is the definition of why trade makes everyone better off ( expanding beyond PPF to unattainable points).
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.