Rosa Received a Corgi Pillow as a Raffle Prize; She

Rosa received a corgi pillow as a raffle prize; she would have been willing to pay $20 to buy it herself. Based on the endowment effect, we would expect Rosa to be willing to sell the pillow

A) for some amount less than $20.
B) only if she is offered more than $20.
C) for the $20 she would have been willing to pay for the pillow.
D) under no circumstances whatsoever.