Answer:
Cost of opportunity is 12 small sculptures for Michael and 5 sculptures for Angelo.
Step-by-step explanation:
The cost of opportunity is the alternative that you sacrifice when you choose an option.
It represents the benefits that you miss out on when choosing one alternative over another.
In this case, the cost of opportunity<u> of painting</u> for each artist is the quantity of sculptures that they can make in the same time.
So, cost of opportunity is 12 small sculptures for Michael and 5 sculptures for Angelo.