Answer:
b. abandon the production of airplane tires to fully specialize in the production of race car tires and then trade with Company Z for airplane tires.
Step-by-step explanation:
Company X has a comparative advantage at producing race car tires
Company Z has a comparative advantage at producing airplane tires.
A country (company) has comparative advantage in production if it produces at a lower opportunity cost when compared to other countries (companies).
A company should specialise only in the production of the good for which it has a comparative advantage.
Company X should specialise in producing race car tires and stop producing airplane tires
Company Z should specialise in producing airplane tires and stop producing race car tires