When Vanessa returns a good library book without finishing it in order to avoid having to pay a late fee what is her opportunity cost?

it depends, if she paid it and returned it early she probably doesn't have to pay.

Explanation:

answer: your option is d

explanation:

question as stated in comment

why did the chinese require the portuguese to pay for goods in gold and silver when trading?

choices

portuguese goods were less valuable than chinese goods.

the chinese already had a surplus of portuguese goods.

the imperial government wanted to stockpile gold and silver.

portuguese and chinese currencies were not exchangeable.

this a history q n in ancient time, theres no money exchange. so ans is portuguese and chinese currencies were not exchangeable.