Which of the Following Demonstrates the Endowment Effect

Which of the following demonstrates the endowment effect?

A) If you received a product as a gift, you are less likely to attach a monetary value to it.
B) Youssra commands a premium in the movie industry because he is endowed with dashing looks.
C) Walid inherits a house in Doha city from his grandfather and is unwilling to sell it for sentimental reasons.
D) Isabella was not willing to part with her "Youssra" DVD although she was offered US$100 for it, a sum greater than the cost of another such DVD.