Answer:
B. Being unwilling to sell a painting that you already own
Step-by-step explanation:
Endowment effect is when individuals value things they own more highly than things they don't own. The endowment effect postulates that individuals are unwilling to exchange things they own for something else of equal value.
The amount people would be willing to accept in exchange for the good they own is usually very high compared to the true value of the object they own.
I hope my answer helps you.