Which of the Following Demonstrates the Endowment Effect

Which of the following demonstrates the endowment effect?

A) Whelan inherits a cottage in Cape Breton from his grandfather and is unwilling to sell it for sentimental reasons.
B) Benedict Cumberbatch commands a premium in the movie industry because he is endowed with dashing looks.
C) Isabella was not willing to part with her "Benedict Cumberbatch" poster although she was offered $100 for it, a sum greater than what it costs to purchase another such poster.
D) If you received a good as a gift, you are less likely to attach a monetary value to the good.