He lowered the sheet to chin level and gave Sam a sour look . " I ' m perfectly fine , Sam , " he uttered through gritted teeth , trying not to give Sam a glimpse of the cursed gap . Just dying of a broken heart , that 's all . Not that you care a whit .
According to the above context, choose the best option to answer the following question.
Question: Why may the narrator feel upset ?
Options:
A. None of the above choices .
B. Sam has just announced that he is moving away
C. Sam has just proposed marriage to him
D. He knows Sam does not feel the same way about him


D