Answer:
I think it means like historical or modern documents that you can use to answer some questions that you have
Explanation:
I think-
Answer:
Opportunity cost is the cost of a foregone alternative. If you chose one alternative over another, then the cost of choosing that alternative is an opportunity cost. Opportunity cost is the benefits you lose by choosing one alternative over another one.
Hope it helps.
Polyester<span> is a thread is made from a plastic compound. Its super cheap to make and that is why it is so widely used.</span>
In the theory the answer is B.