Luke 's fish died . Just before I was going to put the boys down for the evening , Wendy came upstairs and mentioned to me in a somber whisper , " Luke 's fish died . Should we tell him now , or should we wait till the morning ? " I could n't stand the idea of my son sleeping peacefully while his fish was belly up in the tank , so I said she better go tell him right away .
According to the above context, choose the best option to answer the following question.
Question: Why might Luke not sleep well that night ?
Options:
A. None of the above choices .
B. He has to take care of his fish
C. He has sleep issues
D. He is upset by a loss


D