Answer:
a. $8 million
Step-by-step explanation:
In the given situation, the $8 million is the best price to finalize your decision as $20 million costs is that cost which is paid last year and these costs are called sunk cost which is not recovered in the future, that means it is already incurred in the past.
Moreover, the sunk cost is not a part of the future decision as this cost is irrelevant now
So, $8 million is a relevant cost to make a better decision